#include<bits/stdc++.h>
using namespace std;
typedef long long ll;

const ll MOD = 1e12;

int main(){
    ll n,ans=1;
    cin >> n;
    for(int i=0;i<n;i++){
        (ans*=(i+1))%=MOD;
        if(ans==0){
            printf("%012lld\n",ans);
            return 0;
        }
    }
    printf("%lld\n",ans);
    return 0;
}