#include<stdio.h>

void main(){
	int i,n,s=0,p;
	scanf("%d",&n);
	
	for(i=1;i<=n;i++){
		p=i*i;
		s=s+p; 
	}
	printf("%d",s); 
		
}
/**************************************************************
	Problem: 1553
	User: admin
	Language: C
	Result: Accepted
	Time:45 ms
	Memory:1144 kb
****************************************************************/