6 files changed, 1188 insertions, 13 deletions
diff --git a/aoc.cabal b/aoc.cabal
index 03feb15..7b8505e 100644
--- a/aoc.cabal
+++ b/aoc.cabal
@@ -125,3 +125,8 @@ executable Day17
  hs-source-dirs:      execs
+executable Day18
+  main-is:             Day18.hs
+  build-depends:       base, aoc, parsec
+  default-language:    Haskell2010
+  hs-source-dirs:      execs
diff --git a/execs/Day17.hs b/execs/Day17.hs
index bb632e0..ccedffe 100644
--- a/execs/Day17.hs
+++ b/execs/Day17.hs
@@ -2,7 +2,7 @@ module Main where
 import           Control.Monad
 import           Data.Map      (Map)
-import qualified Data.Map      as Map
+import qualified Data.Map      as M
 import           Data.Maybe
 import           Utils
@@ -12,7 +12,7 @@ toBool '#' = True
 toBool '.' = False
 gridMap :: String -> Map Pos Bool
-gridMap s = Map.fromList
+gridMap s = M.fromList
          [((x,y,0,0), toBool a)
          | (y, row) <- zip [0..] rows
          , (x, a) <- zip [0..] row
@@ -35,13 +35,13 @@ convert False 3 = True
 convert _ _     = False
 doStep :: Map Pos Bool -> Map Pos Bool
-doStep m = Map.mapWithKey fn $ m <> Map.fromList [(p, False) | p <- concatMap around (Map.keys m)]
+doStep m = M.mapWithKey fn $ m <> M.fromList [(p, False) | p <- concatMap around (M.keys m)]
    where fn pos v = convert v n
-            where n = howMany id $ map (fromMaybe False . flip Map.lookup m) $ around pos
+            where n = howMany id $ map (fromMaybe False . flip M.lookup m) $ around pos
 main :: IO ()
 main = do
    n <- readFile "input/17"
    let grid = gridMap n
-    print $ Map.size $ Map.filter id (iterate doStep grid !! 6)
+    print $ M.size $ M.filter id (iterate doStep grid !! 6)
diff --git a/execs/Day18.hs b/execs/Day18.hs
new file mode 100644
index 0000000..8a33cba
--- /dev/null
+++ b/execs/Day18.hs
@@ -0,0 +1,399 @@
+module Main where
+import           Prelude hiding ((*))
+-- part 1
+-- infixl 6 *
+-- part 2
+infixl 5 *
+a * b = product [a, b]
+main :: IO ()
+main = print $ sum ls
+ls =
+    [ 9 + 2 * ((7 + 9 + 5 + 7) * 3 + (5 * 3 * 6 * 5 + 6) + (9 * 4 + 9 * 6 + 9)) * 8 + 5
+    , (5 * 2 * 2 + (3 * 8 * 9 * 7) * 3 * 9) * (7 + 3 + (5 + 4 + 8 + 6) + 3 + 2 + 2) * 4 * 8
+    , 2 + 6 * (2 * (2 * 6) * 3 + (7 + 2 * 4 + 7)) * 8 + 5 * 4
+    , 7 + 5 + (8 * 6 + 8) * 6 + (4 * 3 + 5 * 8 + 7 * 9) + 5
+    , ((4 * 8 + 2 + 9 * 3 * 7) * (3 + 6 + 3 * 2 * 7 + 4) + 2 * (9 * 5) * 4 * 3) + 9 + (3 + 9 * 2 + 9 + (4 * 3) * (4 + 4 + 7 * 5 * 2 * 9)) * 4
+    , (8 + 8 + 3) * 7 + (7 * 7 + 7)
+    , 9 + ((8 * 2 * 6 + 2 + 6) * 6 + 3 + 2 * 9) * 3 * ((7 * 4 + 6) * 5 * 6 + 4 * 5 + 5) + 2 + 2
+    , ((3 * 3 * 5 + 7 + 5 + 8) + 7 + 2 * (4 + 9 * 8 + 7 * 2)) + 6 + 3 * 7 + 6 + 9
+    , (6 * 2 * 7) + (6 * 9 * 5 + 2 + (2 * 6 * 3) * 7) * (5 + 9 + 8 + 6 * 6) + 2
+    , 2 * 4 * 8 + 9 + ((9 + 5) + 9 * 7) * (7 * 7 * (2 * 5 + 2 + 4 + 6) * 5)
+    , 2 * 3 * 8 * (3 * 7 * 8 * 5) + 4
+    , 6 + ((8 * 3) * 2 * (7 * 2 + 5 + 2) + (9 * 2) * (2 + 3 * 9) * (5 + 9)) * 2 + 9
+    , 3 + 7 * 9 * 3 * (4 * 7 * 8 * 8 + 2)
+    , (5 + 2 * 6 + 4 * 7) * (4 * 5 + 4 * 3 * 9) * (9 * 7) + 3 + 7
+    , (5 + 6 + 8 + 8 * 2) * 2
+    , 9 + 2 * 4 + (9 + 2 + 9 + 4)
+    , 7 + 6 + (3 + 4 + 9 * 2 + (9 * 3 * 5 * 5 * 3)) * 5 + (8 + 6 * 8 * 4 + 5) * (3 + (6 + 7 + 5 + 4))
+    , 6 + 3 + 2 * ((7 + 3 + 8) + 2 + (9 * 6 + 4) * 3) + 3
+    , 8 + (3 + (7 + 7 + 5 + 3 + 7) * 9 + (4 + 6 + 4 + 6 + 3) + (9 + 3 + 8 * 6)) + 9 * (3 + 7 + 9 * (6 * 8) + 7) + (8 * 4)
+    , 4 + 8 * 2 + (6 + 6 * (7 * 7 + 3 + 6 * 6) + (9 * 4 + 9 * 3 * 6 + 7) + 6) + ((3 * 5 * 6 * 8 + 3) * 3 * (5 + 2 + 5 + 9) + (8 * 5 + 5 + 6 + 6) * 5 + 2)
+    , 9 + ((4 * 6 * 8 + 8 * 2 * 3) + 3)
+    , 2 * ((6 + 4 + 3) * 8 + 2) * 9 + 6
+    , 9 * (5 * 8 + 6) + 3 * 4 * 2 * 8
+    , 2 + (2 + 8 * (3 + 6 + 7 * 5) + 2 + 3 + 2)
+    , 8 * 8 + (3 + 7 + 2 * 3 * 3) * 6 + 7
+    , (4 * 6 * 4 * 4 * 4) * 6 * (2 * 2 + 7 * (5 + 9 + 2) + (3 * 6 + 6) + 7) + 5 + 7 + 8
+    , 5 + (7 + 2 * 9) * (4 * 5 + 8 * 4 + 4) * 9 * 6
+    , 5 + 7 * (4 * 7)
+    , 4 + (8 * 6)
+    , 9 + 3 * 6 + (7 * (4 + 9 + 2) * 5)
+    , 5 + 4 * 6 + 2 + 8 + (7 + 5 + (6 * 8 + 2 * 3))
+    , 5 + (6 + 9 + (5 * 4 + 5) + 3 * 6 + 6)
+    , 6 + 5 + 5 + ((2 + 8 * 8 * 8) + (8 * 8) * (9 + 6 * 6 + 7 * 5) * 8 * 9) * 4 * 3
+    , ((2 + 5 * 9) * 3 * 9 + (9 + 6 + 3) * 9) * 4 * 9 * 7 * 6
+    , 5 + (2 + (3 * 4 * 4) * 5 + 4 * 9 * (5 + 7 * 3))
+    , 3 + 4 + 6 + 5 + 4
+    , 2 * 4 + 6
+    , 2 + 2 + (7 * (5 + 3 * 5 * 3 + 8 * 7) * 7 + (8 * 7 * 7)) + (8 * 9 * 5) + 8
+    , 3 * 8 + 5 + 4 * (3 + (9 + 4 + 3) + (7 + 6 * 4 + 9 + 9 + 7) + (9 * 4 + 7 + 7 * 9) * (5 * 7 * 3 * 7 + 9 + 2) + 4)
+    , 5 + 6 + (8 * 4 * 7) + 5 * ((8 * 8 + 5 + 9 + 2 + 9) + 3 + 5 * 9) + (3 + (6 * 2 * 3 * 7) + 5 + 3 * 8)
+    , 6 * 4 + 8 + (6 * 4 * 8 + 4) * 6 + 4
+    , 2 * (9 + 9 + (3 + 2 + 6) * 7 + 5 * 4) + 2 + 7 * 7 * 2
+    , 6 + 3 * 6 * 7 * (2 + (9 + 7 * 5 + 9 * 3 + 4) + (5 + 8 * 6) + 2 * (6 * 6 + 5 * 6) + 4) + 4
+    , (9 * 8 * 9 + 7 * 8 * 6) + 3
+    , (6 + 8 + 9) + 4 + (6 + (4 + 4 + 2 + 3 + 6 * 3) + (4 * 3 + 7 * 5 * 6) * 9 + 9) * 3
+    , (3 + 6) + (3 + 4) + 3 + 4 * 4 + 2
+    , ((9 + 2 * 2) * 7 + 6) * 5 + 9 * 6 * (3 * 4 + 2 + (2 * 7) * 7 + 2) * ((4 + 3) + 8 + (4 + 2 * 2) + 8 + 8)
+    , 2 + ((7 + 8) * 2 + 6 + 3 * 7 + 9)
+    , 4 * (2 * (2 + 6 * 7 + 6) + (9 * 7 + 5 * 7 * 2))
+    , (4 * (3 + 9 + 2 * 7 * 7 * 5) + 7 + 7 * (8 * 2 + 7 * 4)) + 9 + 6
+    , ((5 + 3 * 5 * 4) + 7 + 9 * 3 + 4 + 5) + 2
+    , 4 * 3 + 2 * 4 * 7 * 3
+    , 6 + ((2 + 5 * 6 * 6 * 9) + 7 * 8 + (8 * 4 + 7 * 3)) + 3 * 2
+    , 5 * 4 * 9 + 2 * (2 * (8 + 5 + 7 + 3 * 8) + 4 * 3 * 9) * 9
+    , 2 * 7 + ((4 * 7 + 6 * 2 + 8 + 9) + (6 + 2 * 8 + 5))
+    , (8 * 2 + 4 + (6 + 5 * 4) * 3 * 6) * 4
+    , ((5 + 7 * 6) + 2 * 6 + 3) + 6 + 2 + 4 * 9
+    , ((3 * 8 + 2) + 5 + (8 + 8 * 3 + 9 + 6 + 3)) * 3
+    , 3 + 6 + 6 + (6 + 5 + 8) * (4 * 5 * 2 * 5)
+    , 3 + (2 + 2 + 6 * 8 * 8) + (7 * 3 + 3 + 7 * 5 + 7) + (6 * 6 + 4 * 7 + 6)
+    , ((4 + 6 * 7) * (5 * 4 + 4 + 4 + 2 + 8)) * 2 + (9 * (8 + 6 * 9)) + ((6 + 8 * 2) * 8 * 2)
+    , 5 + 2 + (4 * 9 * 4 * 2 + 3 * 4) + 8
+    , ((2 * 4) + (6 * 9) * 5) * 5 + 6
+    , ((5 + 3) * (3 + 9 * 7) * 5 * 6 + 3) * 3
+    , 3 + 4 * 5 + 6 * 7
+    , (8 + 4 * 6 + 7 * 6) + (2 * 3 * 3 * 2 * 3) * 2 * 3 + 9 * 5
+    , ((6 + 9 + 4 + 9 * 7) + (3 + 4) + 7 + 2 + (3 * 9 + 4 * 5 + 9) * 4) * 4 + 7
+    , 8 * 6 * 9 + (9 + 3 + (3 + 5 * 8 + 7 * 9) * 5 * (4 + 6 * 9 + 3) + 6) + 4 + 6
+    , 9 * 2 * ((6 * 3 + 6) + 5) + (5 + 8 * 9 + 5 + (8 * 6))
+    , ((9 * 7 * 4 * 7 + 3 + 7) + 4 + 5) * 8 + 6 + 3 * 4 + ((9 * 7 * 8 * 3 * 8) + 3 + 5 * 6 + 2)
+    , 9 + (8 + 2 * 9 + 8) * (8 * 5 * 4 + 6 + 2 * (4 + 9 * 4 + 5))
+    , 3 + 7 * 5 * 4
+    , (8 * (9 + 5 * 6) * (9 + 6 * 9 + 7 + 5) + 7 + 4 * 6) * 4
+    , (4 * (5 * 5 * 5 * 7) + 3) * (6 * 3) + 3 + 4
+    , 3 + ((7 + 2 + 4) + 9 + 4) * (2 * 9 + 4 * 3 * 6) + 8 * 9 + 8
+    , 3 * (7 * 9 * 5 + 2 * 5 * (5 + 5)) + 8 * 5
+    , 5 * ((2 + 7 + 8 * 9) + (3 + 4 + 6 + 4 + 4 * 4) * 4 + (5 * 8 + 3) * 3 * (9 + 9 + 6 * 5 + 6)) * 5
+    , (5 * 7 + 2 + 8) + 8
+    , (4 + 6 * (2 + 8 + 5 * 6 + 7 + 4) * 3 + (6 + 4 + 7)) + (6 + 5 * 6) * 2 + (3 * 2 + 2 + 5 + 9 * 8)
+    , 5 * 2 + ((2 * 2 * 2 + 6) * (2 * 3 * 3 + 6 + 9 + 6) * 8 * 8) * (8 + 5 * 4 + 9) + 2 * 4
+    , 4 * (6 + 9) + 8 + 3 + (5 + 2 + 8) + 5
+    , 9 * 6 * 6 + 5 * 7
+    , (2 * (6 * 9 * 8 + 3) + 3 * 3) * 3 + 8 * 7
+    , (3 * 7 * (9 * 2 + 4 + 5 * 4) + 2) + 3 + 3 + 7 * 8
+    , 8 * (9 * (7 * 9) + 2 + 2 * 9 * 9) + ((5 + 5 + 9 * 2 * 6 + 3) + 9 * 6)
+    , (9 + 8 + 5) + 5 + 9 + 4 * 5
+    , 8 + (7 * 6 * 5 + 3 * (8 * 5 + 9)) * 9 + 2 + 3 + 5
+    , (9 * 9 * 2 + (2 + 9 + 3 + 7) + 5) * 4 + 4 * (4 * 9 * 2 * 6) * 7
+    , 7 * 9 * (4 + 9 + 7 + 9 + 3 + 5) + 4 * (3 + 6) * 4
+    , 5 + ((3 + 6) * 8) * 2
+    , 7 + (2 * 3 * 5 + 8) + ((7 * 4 * 9 + 4 * 6 * 2) * 2) * 3 + 2
+    , 8 + (3 + 6 + (4 * 7 * 9 + 2 + 2)) * 6 + 4 * 4 + 9
+    , (4 * (3 + 2 * 6 * 3 + 5) * 4 + 9 + 8) + 7 * 7
+    , (8 + 7 * 9) + 7 + (4 * (7 * 2 * 7) * 2) + (6 + 8 * (3 * 7 + 3 + 3 * 2 * 2) + (8 * 4 * 6 + 3))
+    , 9 + 3 + ((7 + 4 * 3 + 6 + 4) * 6 * 2 + 7 * 4) * 5
+    , ((3 + 7) + 4) + 3 * 5 + (3 + 7 * 9 + 6 * 3 * 2)
+    , 7 + (4 + 4 + 9 * 5)
+    , ((5 + 3 * 7) + 6 + 8 + 2) + 3 * 8 * (3 + 9 * 6 + 4)
+    , 3 + 8 + 7 + ((3 * 8 + 7 * 4 * 5) + 3 * 8 * 9 * 4 + 3) * 7
+    , 5 * 3 * ((7 + 3 + 7 * 5 + 3 + 4) * (8 + 8 + 3 + 7 * 8 + 6)) * 6 + 4
+    , (4 * (6 + 3 * 7 * 4) + 7 * 8) + 8
+    , 6 * (8 + 6 + 5 * 4) + 3 + ((3 * 6 * 4 * 2 * 6) * 8) * 9 + 6
+    , (4 * (9 + 9 + 9 * 7 * 8 + 9) * (3 * 5 + 8 * 4 * 3) + 2 + 9 + 4) + (7 + 5 + (9 + 3 + 8) * (9 * 7 * 5 * 4) * 5) + 2 + 2 * 5 + (2 + 5 + 9 + (2 + 8 * 5 + 5 * 2 * 7) * 2 + (6 + 3 * 8 + 2 * 6))
+    , (4 * (7 * 3) + (6 + 3) * 6 + 6) + (6 * (8 + 2 + 8 * 4 * 7 * 5) + 7 + (5 * 9 * 5 + 9 * 2) * 7 + 8) * 5 + 2 + 6 * 4
+    , 6 * 9 + 8 * (7 * 4 + 5) + 6 * (5 * 8 * 4 * 2 + (3 * 6) + 6)
+    , 6 * 3 * (4 * 2) * 5
+    , 7 + 6 + (4 * 9 * 3 + 2 * 9 + 6) * 4 + 7 * 7
+    , (2 + (2 * 7 + 9 + 4)) * 9 * 8 * (3 + 9 * 6 * 9) * 4 * 9
+    , (8 * 6 + (3 + 8 * 5 + 6 + 9) * 7 + 6 * 7) + 6 + 4 + 8 * 3
+    , (4 * (7 * 9 + 5 + 7 + 2 + 7)) * (6 * (2 * 2) + 9 * 4 + 5) + (3 * 3 + 4 * (2 * 7 + 4) + 3) * 5 * 6 + 9
+    , 2 + (7 + 7) + 9 + ((9 * 2 + 2 * 8 * 5) + (2 + 3 * 2 + 8 + 9) * 3 + 7 * 4 + 2) + 3
+    , ((7 + 7 + 6) + 6 + 8 + (4 + 4 + 6 * 5 * 3 * 7)) + 6 * 7 * 9
+    , 2 * 9 + 9 * 6 * 2 + (8 * (3 * 3 * 7 * 6) * 4)
+    , 4 * (9 * 2 * 8 + 3 * 5) + 7
+    , 9 + 3 + 9 + 9 + 2 + (5 + 9 * 3 * 2 + 3)
+    , 6 + 7 + (2 + 5 + 2 + 8 * 4 * 8)
+    , (9 + 7 * 3) + 4 * 4
+    , 6 * 7 + 9 * (8 + 7 * 4) * 8
+    , (8 * 5) * 6 + 8 + (4 * 5) * 6
+    , 2 * 8 * 7 + (8 * (4 * 2 * 2 * 9 + 9) + (5 * 7 * 5 + 7)) * 8 + 5
+    , 5 * (5 * 8) + 8 + (9 * 8 * 2) * (5 + 4 * 3) * (4 * 7 * 6 + 2 + 4)
+    , 3 + 6 * 8 + (5 * (6 * 3) * 9 + 5 + 4 * 8)
+    , 7 * 2
+    , 8 * (7 + (7 * 8))
+    , 4 * ((8 * 2 + 2) + (9 * 5 * 2 + 3 + 6) * 6 * (3 + 5)) * 6 + 7 * 3 + 7
+    , 4 * 6 + 7 * ((3 * 5 * 4) * 7) * (2 + (7 * 3 * 4) * (5 + 3 + 6 * 8 + 7 + 4) * (5 + 7 + 7 + 3 * 3)) * 2
+    , (8 * 8 + 2 * 4 * 7) + 9 * 8 * 6 + (8 * 4 * 2)
+    , (4 * 8 + (6 * 7 + 5 + 7 + 4) + 8 + (9 + 3 * 8 + 8 + 6 + 9) * 3) * (4 * 4 + (6 * 7 + 7 * 9 + 9)) + 8
+    , 3 + (9 * 8 * 4 * 9 + 8 * 7) * 9 * 2
+    , 6 + 4 * (8 + (6 * 8) * 7 * 5) + 9 + 4
+    , (8 + 9 * (4 + 3 + 6 + 2 + 5 + 8) + 6) + 7 + 9 * 3 * ((7 * 8 * 6 * 5 + 4) + 7 * (9 + 2 + 9 + 8 * 4) + 8 * 4 + (8 * 8 * 2 + 9 * 4)) + 6
+    , (9 * 8 + 4 * (6 + 9 * 3 * 3 + 3 * 4) * 8 + 7) + 5 * (4 * 8 * (2 * 3 + 2) + 3 + 5 + 2) + ((2 * 6) * 8 + 6 * 4 + 8) + 6 + 9
+    , ((9 + 3 + 9 + 7) + 3) + 7 * ((8 + 6 * 7 * 4 * 7) * 8 * 8 + 2 + 6) + 3 * 8 * 4
+    , (5 + 3 * 2) + ((4 + 3 * 5 * 5) + 6 + 7) + 7 * 7 + 8
+    , 4 + (9 + 4 + (9 * 7 * 8) + 5 + (5 + 7 * 5 * 8) + 8) + (6 + 5 * 5 + 7 + 9 * 8) * 9 + (4 + 4 * 8) + (5 + 4)
+    , 3 * (3 * (6 + 5 * 5 + 4 + 9 + 9) * 8 + (6 * 3 * 2 * 5)) * (6 + 2) * (4 * 6 * 8 * 5 * 5 * 2)
+    , 4 + 7 * (6 + 2 * 3) + 9 * (3 * 3 + 8 + 5 * (8 * 7 + 3 * 5) + 8)
+    , 5 * (2 + 9 + 9 + 8 + 4 * (7 + 2 + 9 + 2 * 6 + 8)) + 2
+    , 5 + (7 * 8 + 8 + 7 + 3) * 2 + 2
+    , 3 + 8 * 8 * (9 * (7 + 5 * 5 * 7) * 6) * 2
+    , 6 + 8 + (3 + (5 * 8 * 6 + 4 + 3 + 4) + (2 * 7 + 4 * 4) + 5) * (4 + 8 * 6 + (9 * 6 + 7 * 3) * 9 * 3)
+    , 4 + 8 * (2 * 9 * 6 + (4 + 9) + 8) * 9 + 6
+    , 5 * 3 * (3 + 7 * 7 * 3 * (6 + 5 * 7)) + 8 * 9
+    , (2 + 8 + (6 * 8 + 5 * 5 * 2)) + 5 * (6 * 5 * 6)
+    , 4 * 5 + (7 * 4 * 3 + 7 * 7) * 8 + ((9 + 9 + 5 * 3 + 2) + (2 * 7 * 8 + 3) + 7 * 2 + (5 + 8 + 8))
+    , 7 * (4 * 2 * (8 * 8 * 7) * 3 * 9 * (2 * 4 * 3 + 2))
+    , 6 * 7 + 8 * 8 * (8 + 2 * 5 + 8 * 6 * (4 + 8 + 3 + 3 * 7)) + 6
+    , 8 + 2 * 2 + (7 + 8 + 5) * (6 + 9 * (4 * 6) + 3 + 8 * 7)
+    , 5 * ((3 + 8 + 4 * 4) * (4 * 5 * 8 * 8 + 8 + 8) + (8 + 7 * 9) + (6 + 5) + 2 * 9) * (7 + 8 * 7 * 4)
+    , (3 + 7) + 9
+    , 9 * 5 + 7 * (3 + (6 + 3)) + 5 * 8
+    , 2 + 6 * 5 + 6 + ((8 * 8 * 9 * 4 * 9 + 6) * 4 + 4 * 2)
+    , 3 * 2 * (6 * 8) * 8 * (2 * 8 * 8 + (4 + 6 * 2 * 4)) * 5
+    , 4 * (8 + 7 + 7 * 8 + (7 + 5)) + 6 + 8 + 7
+    , (5 + 4 + (7 * 7) * 2 * 4 + 3) + (8 * (6 + 6 * 9 + 7 * 7 * 3) * 2) * 3 + 5 + 9 + 7
+    , 8 + (8 * (5 + 3 * 7 * 6 * 7) * 9 * 9 + 7) * 8 * 4
+    , 7 * (6 * 8 * (6 * 3 + 9 + 8 + 8) + 7) + 7 * 7 * 3 + 4
+    , 2 + (9 * 4 * (9 + 7 + 6) + 3 * 8 + 7) + 7 * 2 + (4 + (7 + 2 + 9 + 9 + 7 + 2) + (9 * 3 + 4 + 4 + 3 + 8))
+    , (4 + 4 * (4 + 7 + 3 + 3 * 9 + 8) + 3) * 7 * (7 * 6 + 9) + 4 * 4 + 5
+    , 8 + 6 * 8 * 5 + (7 * (4 + 9 + 3 * 6 + 8) + (7 * 9 * 2 + 3 * 2 + 8) * 6 + (4 + 7 + 4))
+    , (3 * (4 * 7 * 3 * 8) * (6 + 7 + 6 * 7 + 7 * 2) * 8 + 5 * 7) + (9 + 8 + 7 + 5 + 6 * 7) * 5 * 4 * 5
+    , 3 + 3 * 2 + ((2 * 3 + 2 + 6 * 6) * 6) * 8 * (3 + 7 * 8 + 6 + 3 + 8)
+    , (5 * 4) * ((3 * 2 + 9 * 4 + 5 + 7) + (7 * 3 * 7 + 9 * 7 * 5) * 7 + 4 + 6)
+    , 3 + 2 + 5 * 7 * 9 + 2
+    , (4 + 6 * 3 + 3 * (6 * 3 + 5) * (6 * 3 + 5)) + 2
+    , 5 + 8 + 6 * 3 + 3 * 2
+    , (8 + 7 * 4) + 7 + 3 + 4
+    , (3 + 3 * 9 + 7 * 7 + 3) + 6 + 5 * (2 + (4 * 2 * 2 + 9 + 6) * 2) * 6 + (7 + 2 + 7)
+    , 9 * 2 * (3 + (8 + 7 * 5 + 3)) + ((9 + 3 + 6 + 7) * 9 * 8 + 5 * 6) + 5
+    , (6 * 4) * 7 + 4 + 3 + 5 * 4
+    , 8 * 2 + (6 * 4 + 3 + 6)
+    , (4 + 5 * 2 + 9 * 9 * 6) * 8 * 7 * ((4 * 3 * 3) + 5 * 6 * 2) + 9
+    , (8 * 5 * (5 * 7 * 5 + 4 + 5) * 2 + 9 * 6) + 4 + 6
+    , 2 * 5 + ((2 + 8) + 3) * 5 + 7
+    , 5 + ((8 + 2 * 6) + (2 * 5 + 6 + 4 * 8 * 7) + 3 + 7 + 8)
+    , 6 * 2 * (6 + 8 * (3 + 7 * 5) * 2 * 7) + 8
+    , 2 + 2 + ((8 + 2) * 8 * 8)
+    , 3 + 7 + ((8 * 2 + 3) * 9 + 2 * 4) + (9 * 9 * (3 + 7 + 3 + 5 + 4) + (8 * 5 + 4) + 9 + 7)
+    , 3 * 5 + ((4 * 8 + 8 + 7) + 8 * (3 * 3 * 7 + 9 * 6 + 3) + (9 + 2 + 3 * 9 * 8)) * ((7 * 8) + 9 + 2 + 9 * 2)
+    , (7 + 9 + (2 + 8 + 7 * 7 + 4) + 9 + 6 + 7) + 6
+    , 2 + ((2 * 9 * 7 + 4) + 3) + 3 * (8 * (9 * 4 + 7 * 3 + 3) + 8 + 5 + 7) * (9 + 9 * 5 + (8 + 9) + 2 + 5)
+    , 8 + (3 + 5 + 9 * 7) + (7 * (9 + 8) + 8 + (9 * 7 + 8 + 6 + 8)) * 2
+    , (3 * (6 + 6 * 6 + 2) * 9 + 5 + 6) + 8
+    , 6 * 5 + ((9 + 5 + 5) + (6 * 5 * 7 * 7) + 7 * (9 * 7 * 4 + 6)) + 7
+    , 2 + 7 * 7 + 2 * ((5 * 8 + 9 + 9 + 8) * 9)
+    , ((2 * 8 * 4 + 2) + 3) * 4 + 9 + 3 + (7 * 7 * 4 + 2 * 2) * 3
+    , 6 * 8 + ((3 + 6 + 4 * 3) + 6) * 3 + 9
+    , (5 + 2 * 3 * 4) * 3 + 7 + 7
+    , ((7 + 4 * 7 + 7 * 9 * 8) * 3 + 9) * (7 * 2 + 9 * 9 * 8) + 5 + 8 + 6
+    , 6 + (2 + (9 * 6) * 4 + 5 + 5) + (5 * 2 + 6 * (2 + 2) + 6 + 9) + 5
+    , 6 * 3 * (6 + 5 + 4 * 8 + (9 + 2 * 4 * 5 + 4 + 7)) + 5
+    , 9 + (2 + 3) * (6 + 5 * 5 * 2 * (3 * 6)) + 6 + 8 + (4 + 8 * 9)
+    , ((7 * 5 * 5 + 9 + 3) * (7 + 7) + (2 + 6 + 6 * 3 + 7) + 5) + 6
+    , 8 + 2 * 9 + 3 + 4
+    , (7 * 8 * 4 * 9 + (9 * 9)) * 4 + (4 + (7 * 3 + 6) + 2 + 4 + 9 * 5) + 9
+    , (4 + 5) * 8 * (5 * 5) * 4 * 8
+    , (4 + (5 + 4)) * 7 * 4 + 9
+    , 3 + 8 * (3 * (5 * 2 + 6) * 9 + (4 * 2 + 6 + 7) + (9 + 9 * 8)) + 5 + ((2 + 7 + 8 + 8) * (7 + 8 + 3 * 9)) * 9
+    , 8 * 9 + ((8 * 7 + 4 * 5 + 8 + 4) + (3 + 8 * 4) + 8 * 3 + 3)
+    , 6 + (6 + (2 * 5 + 2 * 8)) * 6 + 8 + 4
+    , ((9 * 5 * 5 + 8) * 9 * 2 * 6 + 3) + 6 + 6 * 6 * ((5 + 3 * 2 + 4) + 8 + 8 + 6 * 4)
+    , ((5 * 3) + 6 + 5 * 5) * (6 * 8) + 3
+    , ((9 * 5 + 6 + 2 * 5 + 3) * 6 * 6 * 7 * 2 * 2) + 6 * 8
+    , 2 + 9 + 3 + 5
+    , 5 + 4 + 3 + 4
+    , 6 + (5 * 2 + 8 * 4 + 9)
+    , (7 * 5 * 3 * 9 * 9) + 6 + 5
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diff --git a/input/18 b/input/18
new file mode 100644
index 0000000..7a097ea
--- /dev/null
+++ b/input/18
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diff --git a/input/18mod b/input/18mod
new file mode 100644
index 0000000..e3685f5
--- /dev/null
+++ b/input/18mod
@@ -0,0 +1,387 @@
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+     , (4 + (2 * 8 + 2 * 6) * 3 + 2) * 9 * 3 * ((2 * 6) + 6 * 3 + 7 * (9 * 8 + 7 + 4)) + 2
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+     , 9 + 5 * 9 * ((2 + 3 + 3 + 6 + 5) + 8) + 2 + (3 + (9 * 9) + 2 * (5 + 8 + 8 + 7) * (8 + 7 + 5 + 5 * 7 * 7) * (9 + 5 * 8 * 5 * 8 + 2))
+     , ((6 * 9 * 5 * 3) + 5 + 3) * 9
+     , (8 * 6 + 7 + 2 + (4 * 7 + 7 + 8 + 8) + 8) + 4 + 3
+     , 4 + (9 * 4 + (2 + 4 * 3) + 9 * 9 + 5) + 5 * 2 * 4
+     , 6 + 2 + 4 + (8 * 8 * (7 * 2 + 7 * 2 * 9 + 6) + 9)
+     , 8 * 8 * 6 * 5 * 5
+     , 4 * 3 + (5 + 2 + 6 * (7 * 8 * 7 + 5) * 5 * 8) * (9 * (6 * 6 + 3 * 5) + 9 + 6) + 6 + (2 + (2 + 5) + 3)
+     , 3 + (6 * 9 * (4 * 4) * (7 + 2 + 9 * 3 + 5 + 8)) + (3 * (6 + 7 * 4 + 9 * 8) + 3 * 5 + 9 * (5 + 9))
+     , (3 + (3 + 3 * 6) * 4) * 5
+     ]
diff --git a/lib/Utils.hs b/lib/Utils.hs
index e0f9d62..d74a7bf 100644
--- a/lib/Utils.hs
+++ b/lib/Utils.hs
@@ -1,11 +1,11 @@
-module Utils where 
+module Utils where
-import           Data.Char (digitToInt)
 import           Control.Monad
+import           Data.Char     (digitToInt)
 import           Data.Either
-import           Data.List (inits, tails)
+import           Data.List     (inits, tails)
-import           Data.Map (Map)
+import           Data.Map      (Map)
-import qualified Data.Map as Map
+import qualified Data.Map      as Map
 binaryToInt :: String -> Int
 binaryToInt = foldl (\a x -> a * 2 + digitToInt x) 0
@@ -18,7 +18,7 @@ xor a b = (not a && b) || (a && not b)
 right :: Either a b -> b
 right (Right b) = b
-right _ = undefined
+right _         = undefined
 bet k (l, u) = k >= l && k <= u
 bet' k (l, u) = k > l && k < u
@@ -57,7 +57,7 @@ rotate (x, y) t = (nx, ny)
          ny = x*sin(pi*t/180) + y*cos(pi*t/180)
 -- [f, f.f, f.f.f, ...]
-repeatF f = f : map (f .) (repeatF f) 
+repeatF f = f : map (f .) (repeatF f)
 makeGrid :: String -> (Map (Int, Int) Char, Int, Int)
 makeGrid s = (grid, width, height) where
@@ -66,7 +66,7 @@ makeGrid s = (grid, width, height) where
    width = length (head rows)
    height = length rows
-- number theory 
+-- number theory
 egcd :: Int -> Int -> (Int, Int)
 egcd _ 0 = (1, 0)
@@ -92,3 +92,4 @@ chineseRemainder ls =
                modulii = map snd ls
                modPI = product modulii
                crtModulii = (modPI `div`) <$> modulii