import javax.swing.JOptionPane; 

public	class	SentinelValue{

	public	static	void	main(String[] args){

		String input = JOptionPane.showInputDialog(null, "Please Enter a number", "Sentinel Value", JOptionPane.QUESTION_MESSAGE);

		int data = Integer.parseInt(input);

		int calc = data;

		while(data != 0){

			String inputInt = JOptionPane.showInputDialog(null, "Please Enter a number", "Sentinel Value", JOptionPane.QUESTION_MESSAGE);

			data = Integer.parseInt(inputInt);

			calc += data;

			}

			System.out.print("Your result is: "+calc);

	}

}