import hashlib

def main():
    INPUT = b"yzbqklnj"
    DIFFICULTY = 5
    i = 0

    END = "0" * DIFFICULTY

    while True:
        message = INPUT + str(i).encode("ascii")
        digest = hashlib.md5(message).hexdigest()
        if digest[:DIFFICULTY] == END:
            print(i)
            break

        i += 1

main()