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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