diff --git a/Main.hs b/Main.hs
index fe89507..91b640a 100644
--- a/Main.hs
+++ b/Main.hs
@@ -8,19 +8,22 @@ import Day3
 import Day4
 import Day5
 import Day6
+import Day7
 
 main :: IO ()
 main = do
   putStrLn "AoC 2024"
-  putStrLn "Day 1"
-  Day1.main
-  putStrLn "Day 2"
-  Day2.main
-  putStrLn "Day 3"
-  Day3.main
-  putStrLn "Day 4"
-  Day4.main
-  putStrLn "Day 5"
-  Day5.main
-  putStrLn "Day 6"
-  Day6.main
+  -- putStrLn "Day 1"
+  -- Day1.main
+  -- putStrLn "Day 2"
+  -- Day2.main
+  -- putStrLn "Day 3"
+  -- Day3.main
+  -- putStrLn "Day 4"
+  -- Day4.main
+  -- putStrLn "Day 5"
+  -- Day5.main
+  -- putStrLn "Day 6"
+  -- Day6.main
+  putStrLn "Day 7"
+  Day7.main
diff --git a/flake.nix b/flake.nix
index 682417c..93a5523 100644
--- a/flake.nix
+++ b/flake.nix
@@ -27,6 +27,7 @@
             haskell-language-server
             ghcid
             cabal-install
+            fourmolu
           ];
         # Change the prompt to show that you are in a devShell
         shellHook = ''
diff --git a/fourmolu.yaml b/fourmolu.yaml
new file mode 100644
index 0000000..87116ab
--- /dev/null
+++ b/fourmolu.yaml
@@ -0,0 +1,21 @@
+# Generated from web app, for more information, see: https://fourmolu.github.io/config/
+indentation: 2
+column-limit: 80
+function-arrows: trailing
+comma-style: leading
+import-export-style: diff-friendly
+indent-wheres: true
+record-brace-space: false
+newlines-between-decls: 1
+haddock-style: multi-line
+haddock-style-module: null
+let-style: auto
+in-style: right-align
+single-constraint-parens: always
+single-deriving-parens: always
+unicode: never
+respectful: true
+import-grouping: legacy
+sort-constraints: false
+sort-derived-classes: false
+sort-deriving-clauses: false
diff --git a/inputs/day7.input b/inputs/day7.input
new file mode 100644
index 0000000..f751345
--- /dev/null
+++ b/inputs/day7.input
@@ -0,0 +1,850 @@
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diff --git a/package.yaml b/package.yaml
index c2ec138..2d659f2 100644
--- a/package.yaml
+++ b/package.yaml
@@ -22,6 +22,7 @@ dependencies:
   - unordered-containers
   - utility-ht
   - vector
+  - split
 
 executables:
   aoc24:
@@ -30,7 +31,7 @@ executables:
       - aoc24
   aoc24-debug:
     main: Main.hs
-    ghc-options: -Wall -threaded -rtsopts -eventlog -prof #-fprof-auto
+    ghc-options: -Wall -threaded -rtsopts -prof #-fprof-auto
     dependencies:
       - aoc24
 
@@ -43,7 +44,7 @@ library:
     - Day4
     - Day5
     - Day6
-    # - Day7
+    - Day7
     # - Day8
     # - Day9
     # - Day10
diff --git a/src/Day7.hs b/src/Day7.hs
new file mode 100644
index 0000000..101a8b5
--- /dev/null
+++ b/src/Day7.hs
@@ -0,0 +1,133 @@
+{-# LANGUAGE DeriveGeneric #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Day7 where
+
+-- import Debug.Trace
+import Control.Monad (replicateM)
+import Data.Attoparsec.Text (Parser, endOfLine, parseOnly, scientific, sepBy)
+import Data.Either (fromRight)
+import Data.Hashable
+import Data.List (transpose)
+import Data.List.Split (chunksOf)
+import Data.Monoid
+import Data.Scientific (coefficient)
+import Data.Text (Text)
+import qualified Data.Text as T
+import qualified Data.Text.IO as T
+import GHC.Generics (Generic)
+
+type CalibrationEq = (Int, [Int])
+
+parseInput :: Parser [CalibrationEq]
+parseInput = parseLine `sepBy` endOfLine
+
+parseLine :: Parser CalibrationEq
+parseLine = do
+  testValue <- parseInt <* ": "
+  nums <- parseInt `sepBy` " "
+  pure (testValue, nums)
+
+parseInt :: Parser Int
+parseInt = fromInteger . coefficient <$> scientific
+
+data ExpSymbol = ESInt Int | ESPlus | ESTimes
+  deriving (Generic, Eq)
+instance Hashable ExpSymbol
+instance Show ExpSymbol where
+  show (ESInt i) = show i
+  show ESPlus = "+"
+  show ESTimes = "×"
+
+allSymbols :: Int -> [[ExpSymbol]]
+allSymbols n = replicateM n [ESPlus, ESTimes]
+
+(+++) :: [a] -> [a] -> [a]
+(+++) a b = (concat . transpose) [a, b]
+
+buildExps :: [Int] -> [[ExpSymbol]]
+buildExps xs = fmap (xs' +++) (allSymbols n)
+  where
+    n = length xs - 1
+    xs' = fmap ESInt xs
+
+evalExp :: [ExpSymbol] -> Int
+evalExp (ESInt x : xs) = foldr f x (chunksOf 2 $ reverse xs)
+  where
+    f :: [ExpSymbol] -> Int -> Int
+    f [ESInt i, ESPlus] acc = acc + i
+    f [ESInt i, ESTimes] acc = acc * i
+    f _ _ = minBound
+evalExp _ = minBound
+
+solveA :: Text -> Int
+solveA txt = getSum $ foldMap f calEq
+  where
+    f :: (Int, [Int]) -> Sum Int
+    f (k, v) =
+      if k `elem` map evalExp (buildExps v)
+        then Sum k
+        else Sum 0 -- neutral for a sum
+    calEq = fromRight [] $ parseOnly parseInput txt
+
+data ExpSymbolB = ESIntB Int | ESPlusB | ESTimesB | ESConcatB
+  deriving (Generic, Eq)
+
+instance Hashable ExpSymbolB
+instance Show ExpSymbolB where
+  show (ESIntB i) = show i
+  show ESPlusB = "+"
+  show ESTimesB = "×"
+  show ESConcatB = "||"
+
+allSymbolsB :: Int -> [[ExpSymbolB]]
+allSymbolsB n = replicateM n [ESPlusB, ESTimesB, ESConcatB]
+
+buildExpsB :: [Int] -> [[ExpSymbolB]]
+buildExpsB xs = fmap (xs' +++) (allSymbolsB n)
+  where
+    n = length xs - 1
+    xs' = fmap ESIntB xs
+
+evalExpB :: [ExpSymbolB] -> Int
+evalExpB (ESIntB x : xs) = foldr f x (chunksOf 2 $ reverse xs)
+  where
+    f :: [ExpSymbolB] -> Int -> Int
+    f [ESIntB i, ESPlusB] acc = acc + i
+    f [ESIntB i, ESTimesB] acc = acc * i
+    f [ESIntB i, ESConcatB] acc = acc * 10 ^ length (show i) + i
+    f _ _ = minBound
+evalExpB _ = minBound
+
+solveB :: Text -> Int
+solveB txt = getSum $ foldMap f calEq
+  where
+    f :: (Int, [Int]) -> Sum Int
+    f (k, v) =
+      if k `elem` map evalExpB (buildExpsB v)
+        then Sum k
+        else Sum 0 -- neutral for a sum
+    calEq = fromRight [] $ parseOnly parseInput txt
+
+inputEx :: Text
+inputEx =
+  T.unlines
+    [ "190: 10 19"
+    , "3267: 81 40 27"
+    , "83: 17 5"
+    , "156: 15 6"
+    , "7290: 6 8 6 15"
+    , "161011: 16 10 13"
+    , "192: 17 8 14"
+    , "21037: 9 7 18 13"
+    , "292: 11 6 16 20"
+    ]
+
+main :: IO ()
+main = do
+  input <- T.readFile "inputs/day7.input"
+  putStrLn "Part 1"
+  print $ solveA inputEx
+  print $ solveA input
+  putStrLn "Part 2"
+  print $ solveB input