#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000


int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
	ll N; cin >> N;
	ll tmp = 1;
	rep(i, min(N, 1000LL)) {
		//cout << i << " " <<  tmp << endl;
		tmp *= i + 1;
		tmp %= 1000000000000;
	}
	if (N < 15)
		cout << tmp << endl;
	else {
		string S;
		while (tmp > 0) {
			S = (char)(tmp % 10 + '0') + S;
			tmp /= 10;
			//cout << S << endl;
		}
		while (S.length() < 12) S = "0" + S;
		cout << S << endl;
	}
    return 0;
}