#include <bits/stdc++.h>

using namespace std;

#define fst(t) std::get<0>(t)
#define snd(t) std::get<1>(t)
#define thd(t) std::get<2>(t)
#define unless(p) if(!(p))
#define until(p) while(!(p))

using ll = long long;
using P = std::tuple<int,int>;

const int dx[8] = {-1, 1, 0, 0, -1, -1, 1, 1}, dy[8] = {0, 0, -1, 1, -1, 1, -1, 1};

int main(){
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    ll N;
    std::cin >> N;

    if(N >= 50){
        std::cout << "000000000000" << std::endl;
    }else{

        ll x = 1ll;
        for(int i=1;i<=N;++i){
            x = x * i % 1000000000000ll;
        }
        std::cout << x << std::endl;
    }
}