#include <iostream>
#define repeat(i,n) for (int i = 0; (i) < int(n); ++(i))
using ll = long long;
using namespace std;
const int mod = 1e9+7;
int main() {
    ll n; cin >> n;
    ll x = 1;
    for (ll i = 1; i <= n; ++ i) x = x * i % mod;
    cout << x << endl;
    return 0;
}