import java.util.Scanner;

public class ReadAndSum
{
    public static void main(String[] args)
    {
       Scanner input = new Scanner(System.in);
       final int SENTINEL = 0;
       
       int sum = 0;
       int x = -1;
      
       while ( x != SENTINEL )
       {
          System.out.print("Enter an integer (ends if it is 0): ");
          x = input.nextInt();

          if ( x != SENTINEL )
             sum = sum + x;  // Add a legitimate input
       }
      
       System.out.print(sum);      
    }
}