#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

int main() {
	long long n;
	cin >> n;
	long long ans = 1;
	long long mod = 1e12;
	bool over = false;
	for (long long i = 1; i <= n; i++) {
		ans *= i;
		if (ans >= mod) {
			over = true;
		}
		ans %= mod;
		if (ans == 0) {
			cout << string(12, '0') << endl;
			return 0;
		}
	}
	if (over) {
		string s = to_string(ans);
		while (s.size() < 12) {
			s = "0" + s;
		}
		cout << s << endl;
	} else {
		cout << ans << endl;
	}
}