diff --git a/2021/nim/common.nim b/2021/nim/common.nim
index 3940de3..02992b3 100644
--- a/2021/nim/common.nim
+++ b/2021/nim/common.nim
@@ -38,14 +38,14 @@ template time*(i: string, body: untyped): untyped =
   when not defined(release):
     echo "NOTE: This is not a real measurement of performance. Compile in release mode with -d:release for best performance."
 
-proc doDay*[T](
+proc doDay*[T, X](
   day: int,
   inputLoader: int -> T,
-  part1: T -> int,
-  part2: T -> int,
+  part1: T -> X,
+  part2: T -> X,
   testInput: T,
-  expectedPart1: int,
-  expectedPart2: int): void =
+  expectedPart1: X,
+  expectedPart2: X): void =
 
   when not defined(release):
     var p1 = testInput.part1()
@@ -61,6 +61,15 @@ proc doDay*[T](
 
   time(&"Day {day} Part 2"): echo day.inputLoader().part2()
 
+proc doDayX*[T, X](
+  day: int,
+  inputLoader: int -> T,
+  part1: T -> X,
+  part2: T -> X,
+  testTuple: (T, X, X)): void =
+  let (tin, expectedPart1, expectedPart2) = testTuple
+  doDay(day, inputLoader, part1, part2, tin, expectedPart1, expectedPart2)
+
 proc doDay*[T](
   day: int,
   inputLoader: int -> T,
diff --git a/2021/nim/day14.nim b/2021/nim/day14.nim
index 6570729..61b591a 100644
--- a/2021/nim/day14.nim
+++ b/2021/nim/day14.nim
@@ -15,15 +15,23 @@ proc stepPolymer(polymer: string, combis: Table[(char, char), char]): string =
     result.add polymer[i]
     i += 1
 
-proc p1(input: Lines): int =
+proc p1(input: Lines): uint64 =
   var (polymer, combis) = input.parse
   for i in 1..10:
     polymer = polymer.stepPolymer combis
   var pps = polymer.toCountTable.values.toSeq
-  max(pps) - min(pps)
+  uint64(max(pps) - min(pps))
 
-proc p2(input: Lines): int =
-  return 0
+proc p2(input: Lines): uint64 =
+  var (polymer, combis) = input.parse
+  for i in 1..40:
+    echo &"Step {i}"
+    polymer = polymer.stepPolymer combis
+  var t = initTable[char, uint64]()
+  for c in polymer:
+    inc t[c]
+  var pps = t.values.toSeq
+  max(pps) - min(pps)
 
 const input = """
 NNCB
@@ -45,4 +53,4 @@ BC -> B
 CC -> N
 CN -> C
 """.strip().split('\n').mapIt(it.strip)
-doDay 14, n => n.loadInput, p1, p2, (input, 1588, 0)
+doDayX 14, n => n.loadInput, p1, p2, (input, 1588'u64, 2188189693529'u64)