# -*- coding: utf-8 -*-

N = int(input())
modulo = 10**12

def factorial(a):
    if a==0 or a==1:
        return 1
    else:
        return ((a%modulo) * (factorial(a-1)%modulo))

ans = ''
if N<=14:
    ans = factorial(N) % modulo
elif N<=50:
    ans = factorial(N) % modulo
    ans = str(ans)
    zeros_str = '0'*(12-len(ans))
    ans = zeros_str + ans
else:
    ans = '0' * 12

print(ans)