#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    ll N; cin >> N;
    ll mod = 1000000000000;
    ll ans = 1;
    int f = 0;
    for(ll i = 1; i <= N; i++) {
        ans *= i;
        if(ans >= mod) f = 1;
        ans %= mod;
        if(ans == 0) {
            cout << string(12, '0') << endl;
            return 0;
        }
    }
    if(f) {
        printf("%012lld\n", ans);
    } else {
        printf("%lld\n", ans);
    }
}