#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
typedef long long ll;

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