diff --git a/Sources/06/06.swift b/Sources/06/06.swift
index 3ad671c..fdc996c 100644
--- a/Sources/06/06.swift
+++ b/Sources/06/06.swift
@@ -22,20 +22,19 @@ struct Day06: Runnable {
     }
     
     func run(fish: [Int], numDays: Int) {
-        var tmpFish = Dictionary(grouping: fish, by: { $0 }).mapValues { $0.count }
+        var fishCount = Dictionary(grouping: fish, by: { $0 }).mapValues { $0.count }
         
         for _ in 1...numDays {
-            var d = [Int:Int]()
-            for f in tmpFish.keys.filter({$0 >= 0}) {
-                d[f-1] = tmpFish[f]
-            }
-            let countPregnant = d[-1] ?? 0
-            d[8] = countPregnant
-            d[6] = (d[6] ?? 0) + countPregnant
-            d[-1] = 0
+            var tmpFishCount = fishCount
+                .filter { $0.key >= 0 }
+                .reduce(into: [:]) { $0[$1.key-1, default: 0] = $1.value }
+            let countPregnant = tmpFishCount[-1] ?? 0
+            tmpFishCount[8] = countPregnant
+            tmpFishCount[6] = (tmpFishCount[6] ?? 0) + countPregnant
+            tmpFishCount[-1] = 0
             
-            tmpFish = d
+            fishCount = tmpFishCount
         }
-        print(tmpFish.values.reduce(0, +))
+        print(fishCount.values.reduce(0, +))
     }
 }