#include <bits/stdc++.h>
using namespace std;
using lint = long long;
template<class T = int> using V = vector<T>;
template<class T = int> using VV = V< V<T> >;

int main() {
  cin.tie(nullptr); ios::sync_with_stdio(false);
  lint n, m; cin >> n >> m;
  if (n >= m) return cout << 0 << '\n', 0;
  lint res = 1;
  for (lint i = 1; i <= n; ++i) {
    res *= i;
    res %= m;
  }
  cout << res << '\n';
}