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


/**************************************************************
	Problem: 1553
	User: admin
	Language: C++
	Result: Accepted
	Time:77 ms
	Memory:2072 kb
****************************************************************/