#include <iostream>
#define ll long long
using namespace std;
ll mod = 1000000007;

ll makeFactrial(ll a);

int main(){
    ll N;
    cin >>N;
    cout << makeFactrial(N) << endl;
    return 0;
}

ll makeFactrial(ll a){
    if (a == 0){
        return 1;
    }else{
    ll pre = 1;
    ll ret;
    for(ll i=1;i<=a;i++){
        ret = (i * pre) % mod;
        pre = ret;
    }
    return ret;
    }
}