#include<bits/stdc++.h>
using namespace std;
int main()
{
int i=1,s=0,n=0; 
cin>>n; 
 for(i=1;i<=n;i++){
 	s+=i*i;
 	
 	
 }
  cout<<s;
   
     
      
      
       
       
       
       
  
  
  


	return 0;
}

/**************************************************************
	Problem: 1054
	User: zy002
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/