christmas/Christmas_Calvin.java

  1 import java.util.Scanner;
  2 
  3 public class Christmas_Calvin {
  4 	public static void main(String[] args) {
  5 		Scanner in = new Scanner(System.in);
  6 		while(in.hasNext()) {
  7 			int n = in.nextInt();
  8 			if (n == 0) {
  9 				break;
 10 			}
 11 			System.out.println(n*(n+1)*(n+2)/6);
 12 		}
 13 		in.close();
 14 	}
 15 }