import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
    Scanner sc=new Scanner(System.in);
    int n=sc.nextInt();
    int i,s=0;
    for(i=1;i<=n;i++) {
    	s=s+i*i;
    }
    System.out.print(s);
    sc.close();
	}

}

/**************************************************************
	Problem: 1553
	User: admin
	Language: Java
	Result: Accepted
	Time:4014 ms
	Memory:40628 kb
****************************************************************/