#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;
using ll = long long;

int main() {
    int n, m;
    cin >> n >> m;

    if (n >= m) {
        cout << 0 << endl;
        exit(0);
    }

    ll r = 1;
    for (int i = 1; i <= n; i++) {
        r *= i;
        r %= m;
    }

    cout << r << endl;

    return 0;
}