#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,h;
    cin>>n;
    h=n*(n+1)*(2*n+1)/6;
    cout<<h<<endl;
    return 0;
}
/**************************************************************
	Problem: 1054
	User: HUANGYIBO
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/