#Solucion reto Security Art Work
#http://www.securityartwork.es/2013/11/18/reto-de-reversing/
#Autor: @rubenvillar

import random

def main():
    constraints = (0,4,6,0,6,0,0,5,6,3,0,5,6,9,2,5)
    serial = ''
    row = random.randint(0,9)
    serial += str(row)
    for i in range(1,16):
        row = random.randint(0,9)
        while (row*i) % 10 != constraints[i]:
            row = random.randint(0,9)
        serial += str(row)
    print(serial)

if __name__ == '__main__':
    main()