using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;

class Magatro
{
    static int[] IdouX = new int[8] { -2, -2, -1, -1, 1, 1, 2, 2 };
    static int[] IdouY = new int[8] { -1, 1, -2, 2, -2, 2, -1, 1 };
    static void Main()
    {
        XY P;
        string[] s = Console.ReadLine().Split(' ');
        P.X = long.Parse(s[0]);
        P.Y = long.Parse(s[1]);
        HashSet<XY>[] Hs = new HashSet<XY>[4];
        for(int i = 0; i < 4; i++)
        {
            Hs[i] = new HashSet<XY>();
        }
        Hs[0].Add(new XY(0, 0));
        for(int i = 1; i <= 3; i++)
        {
            foreach(XY v in Hs[i-1].ToArray())
            {
             
                for(int j = 0; j < 8; j++)
                {
                    XY q = v;
                    q.X += IdouX[j];
                    q.Y += IdouY[j];
                    Hs[i].Add(q);
                }
            }
        }
        for (int i = 0; i < 4; i++)
        {
            if (Hs[i].Contains(P))
            {
                Console.WriteLine("YES");
                return;
            }
        }
        Console.WriteLine("NO");


    }

}
struct XY
{
    public long X, Y;
    public XY(long x,long y)
    {
        X = x;
        Y = y;
    }
}