#include<bits/stdc++.h>
using namespace std;
int main()
{
    int i=1,s=0,n;
    cin>>n;
    for(i=1;i<=n;i++){
    	s+=i*i;
    	
    	
    	
    }
    cout<<s;
	return 0;
}

/**************************************************************
	Problem: 1054
	User: LYY001
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/