#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <queue>
#include <cstdio>
#include <ctime>
#include <assert.h>
#include <chrono>
#include <random>
#include <numeric>
#include <set>
using namespace std;
typedef long long int ll;
using ull = unsigned long long;

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    ll n,m; cin >> n >> m;
    if(n>=m){
        printf("0\n");
    }
    else{
        ll res=1;
        for(ll i=1;i<=n;i++){
            res*=i;
            res%=m;
        }
        printf("%lld\n",res );
    }
}