The sum between two numbers

import java.util.Scanner;


public class TheSumBetweenTwoNumbers {
    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);

        System.out.println("First:");
        int first = Integer.parseInt(reader.nextLine());

        System.out.println("Last:");
        int last = Integer.parseInt(reader.nextLine());

        int y = 0;
        int sum = 0;

           while (y >= last) {
           sum = sum + y;
           y++;


           }

           System.out.println("The sum is " + sum);
    }
  }