using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            String line = Console.ReadLine();
            String[] s = line.Split(' ');
            int X = int.Parse(s[0]);
            int Y = int.Parse(s[1]);
            if (X == Y)
                Console.WriteLine(0);
            else if (X == 0)
                Console.WriteLine(2);
            else if (Y == 0)
                Console.WriteLine(1);
            else if (X == -Y)
                 Console.WriteLine(3);
            else
                Console.WriteLine(-1);
        }
    }
}