#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,j=0;
    cin>>n;
    for(int i=1;i<=n;i++){
        j=j+i*i;
    }
    cout<<j;
}
/**************************************************************
	Problem: 1054
	User: chenjiahui
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/