# include <bits/stdc++.h>
# define int long long
# define FILE(x) freopen(x".in", "r", stdin); freopen(x".out", "w", stdout);
using namespace std;
const int mod = 1e12;
int n;
int ans = 1;
signed main()
{
    //FILE("factorial");
    cin >> n;
    if (n >= 50)
    {
        for (int i = 1; i <= 12; i ++)
        {
            cout << 0;
        }
        return 0;
    }
    for (int i = 1; i <= n; i ++)
    {
        ans = ans * i % mod;
    }
    string s = to_string(ans);
    while (s.size() < 12)
    {
        s = "0" + s;
    }
    if (n >= 15) cout << s;
    else cout << ans;
    return 0;
}