diff --git a/Maths/3n+1.py b/Maths/3n+1.py
index 1f2fb55d5..6424fe0d8 100644
--- a/Maths/3n+1.py
+++ b/Maths/3n+1.py
@@ -13,7 +13,7 @@ def main():
         return l , c
     print(n31(43))
     print(n31(98)[0][-1])# = a
-    print("It took {0} steps.".format(n31(13))[1]))#optional finish
+    print("It took {0} steps.".format(n31(13)[1]))#optional finish
 
 if __name__ == '__main__':
     main()