#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;
    ll ans = 1;
    for (ll i=2; i<=N; i++) {
        ans *= i;
        ans %= 1000000000000;
    }

    cout << ans << endl;
}