// {{{ Templates
#include <bits/stdc++.h>

#define show(x) cerr << #x << " = " << x << endl

using namespace std;
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;

template <typename T>
ostream& operator<<(ostream& os, const vector<T>& v)
{
    os << "sz:" << v.size() << "\n[";
    for (const auto& p : v) {
        os << p << ",";
    }
    os << "]\n";
    return os;
}

template <typename S, typename T>
ostream& operator<<(ostream& os, const pair<S, T>& p)
{
    os << "(" << p.first << "," << p.second
       << ")";
    return os;
}


constexpr ll MOD = (ll)1e9 + 7LL;

template <typename T>
constexpr T INF = numeric_limits<T>::max() / 100;

// }}}

int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);

    ll N;
    cin >> N;

    ll zeros = 0;
    ll num = N;
    while (num > 0) {
        zeros += num / 5;
        num /= 5;
    }
    show(zeros);
    if (zeros >= 12) {
        cout << "000000000000" << endl;
    } else {
        ll p = 1;
        constexpr ll mod = 1000000000000LL;
        bool exceed = false;
        for (ll i = 1; i <= N; i++) {
            p *= i;
            if (p >= mod) {
                exceed = true;
            }
            p = p % mod;
        }
        if (exceed) {
            string s = to_string(p);
            for (int i = 0; i < 12 - s.size(); i++) {
                cout << 0;
            }
            cout << p << endl;
        } else {
            cout << p << endl;
        }
    }

    return 0;
}