#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
#define pb push_back
#define mp make_pair
#define rep(i,n) for(int i=0;i<(n);++i)
const int mod=1000000007;

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	int n,m;cin >> n >> m;
	if(n>=m) cout << 0 << endl;
	else{
		ll ans=1;
		for(int i=2;i<=n;++i){
			ans*=i;
			ans%=m;
		}
		cout << ans << endl;
	}
}