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

int main() {
	ll n;
	cin >> n;
	if (n >= 60) {
		cout << "000000000000" << endl;
		return 0;
	}
	ll ans = 1;
	bool b = false;
	while (n != 0) {
		ans *= n--;
		if (ans >= 1000000000000) {
			b = true;
		}
		ans %= 1000000000000;
	}
	if (b) {
		cout << setfill('0') << setw(12) << ans << endl;
	}
	else {
		cout << ans << endl;
	}

	return 0;
}