#!/usr/bin/python3
# -*- coding: utf-8 -*-
# ex03_factorial.py

nNum = int(input("Número: "))
nOriginal = nNum
for n in range (1,nNum):
    nNum = nNum * n
    # print("n: %d, nNum: %d"%(n,nNum))
print("%d! = %d"%(nOriginal,nNum))