#include<bits/stdc++.h>
using namespace std;
int main(){
	int a[1001],b[1001];
	b[0]=0;
	for(int i=1;i<=1000;i++){
		a[i]=i*i;
		b[i]=b[i-1]+a[i];
		//cout<<a[i]<<" "<<b[i]<<endl;
	}
	int n;
	cin>>n;
	cout<<b[n];
	
    return 0;
}

/**************************************************************
	Problem: 1553
	User: liujinhao
	Language: C++
	Result: Accepted
	Time:51 ms
	Memory:2072 kb
****************************************************************/