diff --git a/haskellAoC/package.yaml b/haskellAoC/package.yaml
index 52040cf..d89207b 100644
--- a/haskellAoC/package.yaml
+++ b/haskellAoC/package.yaml
@@ -20,15 +20,19 @@ extra-source-files:
 description:         Please see the README on GitHub at <https://github.com/mx42/haskellAoC#readme>
 
 dependencies:
+- aeson
 - base >= 4.7 && < 5
 - containers
 - directory
 - matrix
 - memoize
 - pureMD5
+- scientific
 - sort
 - split
+- unordered-containers
 - utf8-string
+- vector
 
 library:
   source-dirs: src
diff --git a/haskellAoC/src/Y2015/Day12.hs b/haskellAoC/src/Y2015/Day12.hs
index ca41b6e..05437fd 100644
--- a/haskellAoC/src/Y2015/Day12.hs
+++ b/haskellAoC/src/Y2015/Day12.hs
@@ -1,12 +1,13 @@
 module Y2015.Day12 (y15day12) where
 
+import qualified Data.Aeson as JSON
+import qualified Data.Vector as Vector
+import qualified Data.HashMap.Strict as HMap
+import qualified Data.Scientific as S
 import Data.Char
-
--- getToNext :: Char -> String -> String
--- getToNext _ [] = []
--- getToNext c (x:xs)
---   | x == c = []
---   | otherwise = x:(getToNext c xs)
+import Data.Maybe
+import Data.ByteString.Lazy.UTF8 (fromString)
+import Debug.Trace
 
 getStructureSum :: String -> Int
 getStructureSum s = sum $ map read $ words $ map keepNum s
@@ -15,7 +16,24 @@ getStructureSum s = sum $ map read $ words $ map keepNum s
           | isDigit c = c
           | otherwise = ' '
 
+getJsonSum :: Int -> JSON.Value -> Int
+getJsonSum n (JSON.Object o) =
+  case isRed of
+    True -> n
+    False -> HMap.foldl' getJsonSum n o
+  where isRed = any red values
+        values = HMap.elems o
+        red (JSON.String s) = (== "\"red\"") $ show s
+        red _ = False
+getJsonSum n (JSON.Array a) = Vector.foldl getJsonSum n a
+getJsonSum n (JSON.Number nb) = n + intval
+  where intval = case (S.toBoundedInteger nb :: Maybe Int) of
+                   Just nb' -> nb'
+                   Nothing -> 0
+getJsonSum n _ = n
+
 y15day12 :: [String] -> (String, String)
 y15day12 (input:_) = (part1, part2)
   where part1 = show $ getStructureSum input
-        part2 = show $ "WIP"
+        part2 = show $ getJsonSum 0 $ fromJust jsonData
+        jsonData = JSON.decode $ fromString input :: Maybe JSON.Value