from hashlib import md5
from binascii import hexlify

def md5sum(n, k=b'iwrupvqb'):
  h = md5()
  h.update(k + str(n).encode())
  return hexlify(h.digest())

if __name__ == '__main__':
  n = 346386
  while md5sum(n)[:6] != b'000000':
    n += 1

  print(n)