#include <iostream>
#include <string>
#include <vector>
#include <set>
#include <cmath>
#include <algorithm>
#include <iomanip>
using ll = long long;
using namespace std;

#define MOD 100000000000
ll fac[100010];
int main(void)
{
    ll N;
    cin >> N;
    fac[1] = 1;
    for (ll i = 2; i < 100010; ++i)
    {
        fac[i] = (i * fac[i - 1]) % MOD;
    }
    if (N < 100010)
    {
        cout << setfill('0') << right << setw(12) << fac[N] << endl;
    }
    else
    {
        cout << setfill('0') << left << setw(12) <<  endl;
    }
    return 0;
}