#include <iostream>
#include <iomanip>
#include <string>
#include<string.h>
using namespace std;
#define ll long long
const ll MOD = 1e12;
int main() {
	cin.tie(0);ios::sync_with_stdio(false);
	ll N; cin >> N;
	
	if (N >= 50) {
		cout << "000000000000" << endl;
		return 0;
	}

	ll ans = 1;
	for (ll i = 1; i <= N; i++) {
		(ans = ans * i) %= MOD;
	}
	if (N >= 20) {
		ll temp = ans;
		ll c = 0;
		while (temp /= 10) {
			c++;
		}
		string str(12 - c - 1, '0');

		cout << str << ans << endl;
		return 0;
	}
	cout << ans << endl;
}