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

int main() {
    int n, m;
    cin >> n >> m;
    int ans = 1;
    if (n >= m) {
        cout << 0 << endl;
        return 0;
    }
    for (int i = 2; i <= n; i++) {
        ans = 1ll * ans * i % m;
    }
    cout << ans % m << endl;
}