#include <bits/stdc++.h> 
using namespace std;
int main(){
    int i=1,z,h=0,p;
    cin>>z;
    while(i<=z){
        p=i*i;
        h=h+p;
        i++;
    }cout<<h;
}
/**************************************************************
	Problem: 1054
	User: xuezihong1
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/