#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <cmath>
#include <bitset>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <algorithm>
#include <complex>
#include <unordered_map>
#include <unordered_set>
#include <random>
#include <cassert>
#include <fstream>
#define popcount __builtin_popcount
using namespace std;
typedef long long int ll;
typedef pair<ll, ll> P;
int main()
{
    ll n, m; cin>>n>>m;
    if(n>=m){
        cout<<0<<endl;
    }else{
        ll ans=1;
        for(ll i=1; i<=n; i++){
            ans*=i;
            ans%=m;
        }
        cout<<ans<<endl;
    }
    return 0;
}