using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        long[] inpt = Reader.ReadLine().Split(' ').Select(a=>long.Parse(a)).ToArray();
        this.goalX = inpt[0];
        this.goalY = inpt[1];
        bool canReach = this.GetAns(0,0, 3);
        string ans = "NO";
        if(canReach) {
            ans = "YES";
        }
        Console.WriteLine(ans);


    }
    
    private bool GetAns(long x, long y, int remain) {
        if(x == this.goalX && y == this.goalY) {
            return true;
        }
        if(remain == 0) {
            return false;
        }
        List<long[]> nextPos = new List<long[]>();
        nextPos.Add(new long[] {x+1, y+2});
        nextPos.Add(new long[] {x-1, y+2});
        nextPos.Add(new long[] {x+1, y-2});
        nextPos.Add(new long[] {x-1, y-2});
        nextPos.Add(new long[] {x+2, y-1});
        nextPos.Add(new long[] {x+2, y+1});
        nextPos.Add(new long[] {x-2, y-1});
        nextPos.Add(new long[] {x-2, y+1});
        foreach (long[] pos in nextPos)
        {
            long nextX = pos[0];
            long nextY = pos[1];
            if(GetAns(nextX, nextY, remain - 1)) {
                return true;
            }
        }
        return false;
    }
    
    private long goalX = 0;
    private long goalY = 0;

    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"


0 0


 
";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
        public static int[] GetInt(char delimiter = ' ', bool trim = false)
        {
            string inptStr = ReadLine();
            if (trim)
            {
                inptStr = inptStr.Trim();
            }
            string[] inpt = inptStr.Split(delimiter);
            int[] ret = new int[inpt.Length];
            for (int i = 0; i < inpt.Length; i++)
            {
                ret[i] = int.Parse(inpt[i]);
            }
            return ret;
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}