#include "bits/stdc++.h"
#define REP(i,n) for(int i=0;i<n;++i)
#define put(a) cout << a << "\n"
using namespace std;
typedef long long ll;

ll n,m;

int main(){
    cin >> n >> m;
    ll res = 1;
    REP(i,n){
        res*=(i+1);
        res%=m;
    }
    put(res);
    return 0;
}