def format(n):
  string = str(n)

  if len(string) != 12:
    return ("0"*(12-len(string)) + string)
  else:
    return string

def main():
  zero_flag = False
  N = int(input())

  answer = 1
  for i in range(2, N+1):
    before_answer = answer

    if len(str(answer * i)) >= 13:
      zero_flag = True

    answer = (answer * i) % (10**12)


    if before_answer == answer:
      break


  if zero_flag:
    print(format(answer))
  else:
    print(answer)

main()