diff --git a/gcd.py b/gcd.py
index 5880a5b..1690c5c 100644
--- a/gcd.py
+++ b/gcd.py
@@ -1,15 +1,20 @@
-# Wrong gcd find 5 mistakes
+# Wrong gcd find 5 mistakes <- maybe this is fifth 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 max(a, b)
+
+
+print(gcd(10, 0))
+print(gcd(123, 3))
+print(gcd(1000000, 64))
+print(gcd(0, 0))
 
-# Examples
 
 # gcd(10, 0) => 10
 # gcd(123, 3) => 3