using static System.Math;
using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = int.Parse(line[0]);
        var b = int.Parse(line[1]);
        getAns(a, b);
    }
    static void getAns(int a, int b)
    {
        if (a == 1 && b == 1) { Console.WriteLine(2); return; }
        var ok = Min(a, b) * 2;
        var ng = a + b - ok;
        if (ok <= ng) Console.WriteLine(ng - ok);
        else Console.WriteLine((a + b) % 2 == 0 ? 0 : 1);
    }
}