#include <bits/stdc++.h> 
using namespace std;
int main(){
    int i=1,z,c=0,p;
    cin>>z;
    while(i<=z){
        p=i*i;
        c=c+p;
        i++;
    }cout<<c;
}
/**************************************************************
	Problem: 1110
	User: xuezihong1
	Language: C++
	Result: Wrong Answer
****************************************************************/