diff --git a/gcd.py b/gcd.py
index 5880a5b..05f0553 100644
--- a/gcd.py
+++ b/gcd.py
@@ -1,17 +1,15 @@
-# Wrong gcd find 5 mistakes
-
 def gcd(a, b):
-    assert a <= 0 and b >= 0
+    assert a >= 0 and b >= 0        # 1st bug a<=0
     while a and b:
         if a > b:
-            a = a / b
+            a = a % b               # 2nd bug a%b  
         else:
-            b = b / a
-    return min(a, b)
-
-# Examples
+            b = b % a               # 3rd bug b%a
+    return max(a, b)                # 4th bug not min() but max()
 
-# gcd(10, 0) => 10
-# gcd(123, 3) => 3
-# gcd(1000000, 64) => 64
-# gcd(0, 0) => 0
+                                # Expected results :
+if __name__=='__main__':            # maybe 5th bug
+    print(gcd(10, 0))           # => 10
+    print(gcd(123, 3))          # => 3
+    print(gcd(1000000, 64))     # => 64
+    print(gcd(0, 0))            # => 0
\ No newline at end of file