#include<bits/stdc++.h>
using namespace std;
using ll=long long;
const ll mod=998244353;
int main(){
  ll n,m;
  cin>>n>>m;
  ll ans=1;
  if(n>=m){
    cout<<0<<endl;
    return 0;
  }
  for(ll i=1;i<=n;i++){
    ans*=i;
    ans%=m;
  }
  cout<<ans<<endl;
}