#include <bits/stdc++.h>
using namespace std;

#define FOR(i,l,r) for(int i = (int) (l);i < (int) (r);i++)
#define ALL(x) x.begin(),x.end()
template<typename T> bool chmax(T& a,const T& b){ return a < b ? (a = b,true) : false; }
template<typename T> bool chmin(T& a,const T& b){ return b < a ? (a = b,true) : false; }
typedef long long ll;

ll N;
const ll MOD = 1e12;

int main()
{
	scanf("%lld",&N);
	ll ans = 1;
	bool flag = false;
	for(int i = 1;i <= min(N,50ll);i++){
		ans *= i;
		if(ans >= MOD) flag = true;
		ans %= MOD;
	}
	if(flag){
		printf("%012lld\n",ans);
	}
	else{
		printf("%lld\n",ans);
	}

	return 0;
}