import java.util.*;
import java.lang.*;
import java.io.*;
 
class Ideone
{
	public static void main (String[] args) 
	{
		double x,y; //описание переменных для хранения входных данных
		Scanner sc = new Scanner(System.in);
		x = sc.nextDouble(); //ввод координат точки
		y = sc.nextDouble();
        if ((y >= 1) || (x >= -1 && x <= 1 && y >= Math.abs(x))) System.out.printf("Belongs"); //проверка
        else System.out.printf("Doesn't belong");
	}
}

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LTAuOCAwLjk=

-0.8 0.9