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

using i64 = int64_t;

int main(){
    i64 n, m;
    cin >> n >> m;
    i64 ans = 1;
    for(int i=1;i<=n;++i){
        ans *= i;
        ans %= m;
    }

    cout << ans << endl;

    return 0;
}