#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,n,s=0;
    cin>>n;
    for(a=1;a<=n;a++){
    s=s+a*a;
    }
    cout<<s;
    return 0;
}
/**************************************************************
	Problem: 1054
	User: chenmingyu
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/