#include <bits/stdc++.h>
using namespace std;

int main() {
  int N, M;
  cin >> N >> M;
  if (N >= M) {
    cout << 0 << endl;
  } else {
    long long ans = 1;
    for (int i = 1; i <= N; ++i) {
      ans = ans * i % M;
    }
    cout << ans << endl;
  }
}