#include <bits/stdc++.h>
#define FOR(i,bg,ed) for(ll i=(bg);i<(ed);i++)
#define REP(i,n) FOR(i,0,n)
#define MOD 1000000007
#define int long long
using namespace std;
typedef long long ll;
typedef vector<vector<ll>> mat;
const int INF = 1e9;



signed main()
{
    ll N;

    cin >> N;
    if (N > 100) {
        cout << "000000000000" << endl;
        return 0;
    }

    ll ans = 1LL;
    bool over = false;
    for (ll i=2; i<=N; i++) {
        ans *= i;
        if (ans >= 1000000000000LL) {
            ans %= 1000000000000LL;
            over = true;
        }
    }

    if (over) {
        printf("%012lld\n", ans);
    } else {
        cout << ans << endl;
    }
}