#!/usr/bin/env python
import sys
total=0
s = raw_input('Numero do cartao (sem sinais) -->')
if (len(s) != 16):
print "Numero errado. faca de novo"
exit()
for i in range(0,16,2):
acum=int(s[i])*2
if (acum > 9):
  acum=acum-9
total=total+acum
for i in range(1,17,2):
total=total+int(s[i])
if ((total%10) != 0 or total > 150):
print "Cartao invalido"
exit()
print "Cartao valido: %s" % s