#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  ll n;
  cin >> n;
  ll ans = 0;
  constexpr ll MOD = 1'000'000'000'000;
  if (n <= 15) {
    ll fact = 1;
    for (ll i = 1; i <= n; i++) fact *= i;
    cout << fact % MOD << '\n';
  }
  else if (n <= 50) {
    ll fact = 1;
    for (ll i = 1; i <= n; i++) {
      fact *= i;
      fact %= MOD;
    }
    cout << setw(12) << setfill('0') << fact << '\n';
  }
  else {
    cout << "000000000000\n";
  }
  return 0;
}