#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,s=0;
    cin>>n;
    for(;n>=1;n--){
        s=s+n*n;
    }
    cout<<s;
}
/**************************************************************
	Problem: 1054
	User: linzihang
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/