#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
#include <iomanip>
#include <array>
#include <numeric>
#include <regex>
#include <bitset>
#include <deque>

using namespace std;
typedef long long ll;
typedef pair<int, int> p_ii;

const int INF = 1e9;
const double PI = acos(-1.0);
const ll MOD = 1e9 + 7;

const ll limit = 1e12;

ll dp[51];

int main() {
    ll N;
    cin>>N;

    dp[0]=1;
    for (int i = 0; i < 50; i++) {
        dp[i+1]=dp[i]*(i+1)%limit;
    }

    if(N<50){
        cout<<setfill('0')<<right<<setw(12)<<dp[N]%limit<<endl;
    }else{
        cout<<"000000000000"<<endl;
    }

    return 0;
}