#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int main(){
    ll n,m;cin>>n>>m;
    if(n>=m){
        cout<<0<<endl;
        return 0;
    }
    ll ans=1;
    for(int i=1;i<=n;i++){
        ans*=i;
        ans%=m;
        
    }
    cout<<ans<<endl;
}