#include <bits/stdc++.h>
#define rep(i,n) for(ll i=0;i<(ll)(n);i++)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e17;
constexpr ll MOD = 1e12;
constexpr double PI = 3.14159265358979323846;

int main(){
    ll n;
    cin >> n;
    if(n > 100){
        cout << "000000000000" << endl;
        return 0;
    }

    vector<ll> dp(n+1,0);
    dp[0] = 1;
    for(ll i=1;i<=n;i++){
        dp[i] = (dp[i-1] * i) % MOD;
    }

    if(n <= 14) cout << dp[n] << endl;
    else printf("%012lld\n",dp[n]);
    return 0;
}