diff --git a/Aufgabe02.py b/Aufgabe02.py
index a909e1062ec9f7f121941cc1732aa4c20c413896..7d0f6f08e94fe32832cb5c7b833f1742263f2c30 100644
--- a/Aufgabe02.py
+++ b/Aufgabe02.py
@@ -74,7 +74,7 @@ def InsertionSort(array):
 
     return sorted_array
 
-def CountingSort(array):
+def CountingSort(array, k=None):
     '''Sort the array by counting the ocjence of each element in the array.
 
     Parameters
@@ -87,4 +87,22 @@ def CountingSort(array):
     sorted_array: a sorted copy of the array
     '''
 
-    return
+    if k is None:
+        k = max(array)
+
+    key_array = [0]*(k+1)
+
+    # Zählen der Elemente
+    for i in array:
+        key_array[i] += 1
+
+    sorted_array = [0]*len(array)
+
+    i = 0
+    for j, k in enumerate(key_array):
+        while k > 0:
+            sorted_array[i] = j
+            i += 1
+            k -= 1
+
+    return sorted_array