#include <bits/stdc++.h>
#define rep(i,n) for(int i=(0);i<(n);i++)

using namespace std;

typedef long long ll;
typedef unsigned long long ull;

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);

	ll n;
	cin >> n;

	if(n >= 70){
		cout << setfill('0') << right << setw(12);
		cout << 0 << endl;
		exit(0);
	} 

	ll ans = 1;
	bool over = false;
	ll bar = 1e12;
	for(ll i = 1; i <= n; i++){
		ans *= i;
		if(ans >= bar) over = true;
		ans %= (ll) 1e12;
	}

	if(over) cout << setfill('0') << right << setw(12);
	cout << ans << endl;
}