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

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

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

  answer = 1
  for i in range(1, N+1):
    answer = (answer * i) % 10**12

    if answer == 0:
      print(format(answer))
      return

  print(answer)

main()