using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using Enu = System.Linq.Enumerable;

class Program
{
    static readonly int MaxMoves = 3;
    static readonly int Offset = 100;
    static readonly int MaxSize = Offset * 2 + 1;
    bool[,] seen = new bool[MaxSize, MaxSize];

    public void Solve()
    {
        int X = Reader.Int(), Y = Reader.Int();
        DFS(Offset, Offset, 0);
        if (X + Offset >= 0 && Y + Offset >= 0 && 
            X + Offset < MaxSize && Y + Offset < MaxSize && 
            seen[X + Offset, Y + Offset]) Console.WriteLine("YES");
        else Console.WriteLine("NO");
    }

    private void DFS(int x, int y, int steps)
    {
        seen[x, y] = true;
        if (steps == MaxMoves) return;
        if (x < 0 || y < 0 || x >= MaxSize || y >= MaxSize) return;
        for (int dx = -2; dx <= 2; dx++)
            for (int dy = -2; dy <= 2; dy++)
                if (Math.Abs(dx) * Math.Abs(dy) == 2)
                {
                    int nx = x + dx, ny = y + dy;
                    DFS(nx, ny, steps + 1);
                }
    }
}



class Entry { static void Main() { new Program().Solve(); } }
class Reader
{
    private static TextReader reader = Console.In;
    private static readonly char[] separator = { ' ' };
    private static readonly StringSplitOptions op = StringSplitOptions.RemoveEmptyEntries;
    private static string[] A = new string[0];
    private static int i;
    private static void Init() { A = new string[0]; }
    public static void Set(TextReader r) { reader = r; Init(); }
    public static void Set(string file) { reader = new StreamReader(file); Init(); }
    public static bool HasNext() { return CheckNext(); }
    public static string String() { return Next(); }
    public static int Int() { return int.Parse(Next()); }
    public static long Long() { return long.Parse(Next()); }
    public static double Double() { return double.Parse(Next()); }
    public static int[] IntLine() { return Array.ConvertAll(Split(Line()), int.Parse); }
    public static int[] IntArray(int N) { return Enu.Range(0, N).Select(i => Int()).ToArray(); }
    public static int[][] IntTable(int H) { return Enu.Range(0, H).Select(i => IntLine()).ToArray(); }
    public static string[] StringArray(int N) { return Enu.Range(0, N).Select(i => Line()).ToArray(); }
    public static string Line() { return reader.ReadLine().Trim(); }
    private static string[] Split(string s) { return s.Split(separator, op); }
    private static string Next() { CheckNext(); return A[i++]; }
    private static bool CheckNext()
    {
        if (i < A.Length) return true;
        string line = reader.ReadLine();
        if (line == null) return false;
        if (line == "") return CheckNext();
        A = Split(line);
        i = 0;
        return true;
    }
}