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

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