diff --git a/school/di-ma/uebung/02/st.py b/school/di-ma/uebung/02/st.py
index b04a7e3..e17a49d 100644
--- a/school/di-ma/uebung/02/st.py
+++ b/school/di-ma/uebung/02/st.py
@@ -22,15 +22,20 @@ def s(n,k):
 
 def S(n, k):
     if n == k:
-        return 1
+        return " S_{" + n + "," + k + "} "
+        # return 1
     elif k == 1:
-        return 1
+        return " S_{" + n + "," + k + "} "
+        # return 1
     elif k == 0:
-        return 0
+        return " S_{" + n + "," + k + "} "
+        # return 0
     elif n < k:
-        return 0
+        return " S_{" + n + "," + k + "} "
+        # return 0
     else:
-        return S(n-1,k-1) + k * S(n-1,k)
+        return " S_{" + str(n-1) + "," + str(k-1) + "} + " + str(k) + " * S_{" + str(n-1) + "," + str(k) +  "} "
+        # return S(n-1,k-1) + k * S(n-1,k)
 
-# print(S(9,5))
-print(p(10,4))
+print(S(5,3))
+# print(p(10,4))