diff --git a/Package.swift b/Package.swift
index 9731741..04c2e4c 100644
--- a/Package.swift
+++ b/Package.swift
@@ -14,7 +14,8 @@ let package = Package(
             .executable(name: "02", targets: ["02"]),
             .executable(name: "03", targets: ["03"]),
             .executable(name: "04", targets: ["04"]),
-            .executable(name: "05", targets: ["05"])
+            .executable(name: "05", targets: ["05"]),
+            .executable(name: "06", targets: ["06"])
         ],
     dependencies: [
         // Dependencies declare other packages that this package depends on.
@@ -58,6 +59,10 @@ let package = Package(
                 .targetItem(name: "Runner", condition: nil)
             ],
             resources: []
+        ),
+        .executableTarget(
+            name: "06",
+            dependencies: [.targetItem(name: "Runner", condition: nil)]
         )
     ]
 )
diff --git a/Sources/06/06.swift b/Sources/06/06.swift
new file mode 100644
index 0000000..8a65fa2
--- /dev/null
+++ b/Sources/06/06.swift
@@ -0,0 +1,49 @@
+//
+//  File.swift
+//
+//
+//  Created by Max Nuding on 05.12.21.
+//
+
+import Foundation
+import Runner
+
+class Fish: CustomStringConvertible {
+    var timer: Int
+    
+    var description: String { "\(timer)"}
+    
+    init(timer: Int = 8) {
+        self.timer = timer
+    }
+    
+    func tick() -> Fish? {
+        timer -= 1
+        if timer < 0 {
+            timer = 6
+            return Fish()
+        }
+        return nil
+    }
+}
+
+struct Day06: Runnable {
+    let inputPath: String
+    
+    func run() {
+        let input = try! String(contentsOfFile: inputPath)
+        let internalCounters = input
+            .trimmingCharacters(in: .newlines)
+            .components(separatedBy: ",")
+            .map { Fish(timer: Int($0)!) }
+        run(fish: internalCounters, numDays: 80)
+    }
+    
+    func run(fish: [Fish], numDays: Int) {
+        var tmpFish = fish
+        for _  in 1...numDays {
+            tmpFish.append(contentsOf: tmpFish.compactMap { $0.tick() })
+        }
+        print(tmpFish.count)
+    }
+}
diff --git a/Sources/06/main.swift b/Sources/06/main.swift
new file mode 100644
index 0000000..0ced939
--- /dev/null
+++ b/Sources/06/main.swift
@@ -0,0 +1,11 @@
+//
+//  File.swift
+//  
+//
+//  Created by Max Nuding on 05.12.21.
+//
+
+import Foundation
+import Runner
+
+Runner(target: Day06.self, day: "06").run()
diff --git a/Sources/Runner/Resources/input/06.txt b/Sources/Runner/Resources/input/06.txt
new file mode 100644
index 0000000..e605103
--- /dev/null
+++ b/Sources/Runner/Resources/input/06.txt
@@ -0,0 +1 @@
+1,2,1,3,2,1,1,5,1,4,1,2,1,4,3,3,5,1,1,3,5,3,4,5,5,4,3,1,1,4,3,1,5,2,5,2,4,1,1,1,1,1,1,1,4,1,4,4,4,1,4,4,1,4,2,1,1,1,1,3,5,4,3,3,5,4,1,3,1,1,2,1,1,1,4,1,2,5,2,3,1,1,1,2,1,5,1,1,1,4,4,4,1,5,1,2,3,2,2,2,1,1,4,3,1,4,4,2,1,1,5,1,1,1,3,1,2,1,1,1,1,4,5,5,2,3,4,2,1,1,1,2,1,1,5,5,3,5,4,3,1,3,1,1,5,1,1,4,2,1,3,1,1,4,3,1,5,1,1,3,4,2,2,1,1,2,1,1,2,1,3,2,3,1,4,5,1,1,4,3,3,1,1,2,2,1,5,2,1,3,4,5,4,5,5,4,3,1,5,1,1,1,4,4,3,2,5,2,1,4,3,5,1,3,5,1,3,3,1,1,1,2,5,3,1,1,3,1,1,1,2,1,5,1,5,1,3,1,1,5,4,3,3,2,2,1,1,3,4,1,1,1,1,4,1,3,1,5,1,1,3,1,1,1,1,2,2,4,4,4,1,2,5,5,2,2,4,1,1,4,2,1,1,5,1,5,3,5,4,5,3,1,1,1,2,3,1,2,1,1