def lucky_sum(a, b, c):
results=0
if a != 13:
results= results + a
if b != 13:
results= results + b
if c != 13:
results= results + c
return results
print lucky_sum(1, 13, 3)
ZGVmIGx1Y2t5X3N1bShhLCBiLCBjKToKICByZXN1bHRzPTAKICBpZiBhICE9IDEzOiAKICAgIHJlc3VsdHM9IHJlc3VsdHMgKyBhCiAgaWYgYiAhPSAxMzogCiAgICByZXN1bHRzPSByZXN1bHRzICsgYgogIGlmIGMgIT0gMTM6IAogICAgcmVzdWx0cz0gcmVzdWx0cyArIGMKICByZXR1cm4gcmVzdWx0cyAKCnByaW50IGx1Y2t5X3N1bSgxLCAxMywgMyk=