diff --git a/gcd.py b/gcd.py
index 5880a5b..75919ea 100644
--- a/gcd.py
+++ b/gcd.py
@@ -1,13 +1,11 @@
-# Wrong gcd find 5 mistakes
-
 def gcd(a, b):
-    assert a <= 0 and b >= 0
-    while a and b:
+    assert a >= 0 and b >= 0
+    while a != 0 and b != 0:
         if a > b:
-            a = a / b
+            a = a % b
         else:
-            b = b / a
-    return min(a, b)
+            b = b % a
+    return (a+b)
 
 # Examples