(⊙﹏⊙)

#include<bits/stdc++.h>
using namespace std;
long long n,p,sum=0,ans=1;
int main()
{

	cin>>n>>p;
	//sum总和 https://www.acgo.cn/application/1690699400919511040， 
	for(int i=1;i<=min(n,p);i++)
	{
		ans*=i;
        ans%=p;
		sum+=ans;
		sum%=p;	
	}
	cout<<sum;
	return 0;
}