// Add up some numbers using a sentinal (-99)
// to mark the end of the numbers to add

import java.util.*;

public class Sum {
 public static void main(String[] args) {
  Scanner console = new Scanner(System.in);
  System.out.println("Let me add some numbers for you.");
  int sum = 0;
  System.out.print("Enter number: ");
  int number = console.nextInt();
  while ( number != -99 ) {
   sum = sum + number;
   System.out.print("Enter number: ");
   number = console.nextInt();
  }
  System.out.println("The sum is " + sum);
 }
}