using System;
using System.Linq;
using System.Text;
using System.Collections.Generic;
using STR = System.String;
using INT = System.Int64;
using DEC = System.Double;

class Program
{
    public static IO IO = new IO();
    static void Main(string[] args)
    {
        INT[] xy = IO.INT(' ');
        PAIR<POINT<INT>, INT> a = new PAIR<POINT<INT>, INT>(new POINT<INT>(xy[0], xy[1], 0), 0);
        BFSPOINT<INT> q = new BFSPOINT<INT>(100, -100);
        string o = "NO";
        q.PUSH(0, 0, 0, 0);
        while (q.SIZE() != 0)
        {
            PAIR<POINT<INT>, INT> x = q.POP();
            if (x.SAME(a)) { o = "YES"; break; }
            if (x.VALUE < 3)
            {
                x.VALUE++;
                q.PUSH(x.KEY.X - 2, x.KEY.Y - 1, x.KEY.Z, x.VALUE);
                q.PUSH(x.KEY.X - 2, x.KEY.Y + 1, x.KEY.Z, x.VALUE);
                q.PUSH(x.KEY.X - 1, x.KEY.Y - 2, x.KEY.Z, x.VALUE);
                q.PUSH(x.KEY.X - 1, x.KEY.Y + 2, x.KEY.Z, x.VALUE);
                q.PUSH(x.KEY.X + 1, x.KEY.Y - 2, x.KEY.Z, x.VALUE);
                q.PUSH(x.KEY.X + 1, x.KEY.Y + 2, x.KEY.Z, x.VALUE);
                q.PUSH(x.KEY.X + 2, x.KEY.Y - 1, x.KEY.Z, x.VALUE);
                q.PUSH(x.KEY.X + 2, x.KEY.Y + 1, x.KEY.Z, x.VALUE);
            }
        }
        IO.WRITE(o);
        IO.FLUSH();
    }
    public static int BIT(INT n)
    {
        int ret = 0;
        for (int i = 0; i < 32; i++)
        {
            if ((1 << i & n) != 0)
            {
                ret++;
            }
        }
        return ret;
    }
}
public class BFSPOINT<T> : QUEUE<PAIR<POINT<INT>, T>>
{
    private bool[,,] f;
    private INT MIN;
    public BFSPOINT(INT max, INT min = 0) : base(max) { MIN = min; f = new bool[max - min, max - min, max - min]; }
    public void PUSH(INT x, INT y, INT z, T value) { PUSH(new PAIR<POINT<INT>, T>(new POINT<INT>(x, y, z), value)); }
    public override void PUSH(PAIR<POINT<INT>, T> v)
    {
        POINT<INT> k = v.KEY;
        INT x = k.X - MIN;
        INT y = k.Y - MIN;
        INT z = k.Z - MIN;
        INT max = m - MIN;
        if (x >= 0 && x < max && y >= 0 && y < max && z >= 0 && z < max && !f[x, y, z])
        {
            f[x, y, z] = true; base.PUSH(v);
        }
    }
}
public class POINT<T> : IEquatable<POINT<T>> where T : IEquatable<T>
{
    public T X;
    public T Y;
    public T Z;
    public POINT(T x, T y, T z) { X = x; Y = y; Z = z; }
    public bool SAME(POINT<T> b) { return Equals(b); }
    public bool Equals(POINT<T> b) { return X.Equals(b.X) && Y.Equals(b.Y) && Z.Equals(b.Z); }
}
public class QUEUE<T>
{
    protected INT m;
    private INT s, e, c;
    private T[] q;
    public QUEUE(INT max) { m = max; q = new T[m]; CLEAR(); }
    public void CLEAR() { e = 0; s = 0; c = 0; }
    public INT SIZE() { return c; }
    public T TOP() { return q[0]; }
    public T POP() { T r = q[s++]; s %= m; c--; return r; }
    public virtual void PUSH(T v) { q[e++] = v; e %= m; c++; }
    public bool EMPTY() { return SIZE() == 0; }
}
public class PAIR<T, U> : IEquatable<PAIR<T, U>> where T : IEquatable<T>
{
    public T KEY;
    public U VALUE;
    public PAIR(T key, U value) { KEY = key; VALUE = value; }
    public bool SAME(PAIR<T, U> b) { return Equals(b); }
    public bool Equals(PAIR<T, U> b) { return KEY.Equals(b.KEY); }
}
public class IO
{
    private const int WMAX = 1000;
    private StringBuilder S = new StringBuilder();
    private T R<T>(Func<string, T> f) { return f(Console.ReadLine()); }
    private T[] R<T>(Func<string, T> f, char c) { return STR().Split(c).Select(f).ToArray(); }
    private T[] R<T>(Func<string, T> f, int l) { T[] r = new T[l]; for (int i = 0; i < l; i++) { r[i] = R(f); } return r; }
    private T[][] R<T>(Func<string, T> f, int l, char c) { T[][] r = new T[l][]; for (int i = 0; i < l; i++) { r[i] = R<T>(f, c); } return r; }
    private void W<T>(Func<T, string> f, T v, bool lf = true) { S.Append(f(v)); if (lf) { S.Append('\n'); } if (S.Length >= WMAX) { FLUSH(); } }
    public STR STR() { return R(s => s); }
    public STR[] STR(char c) { return R(s => s, c); }
    public STR[] STR(int l) { return R(s => s, l); }
    public STR[][] STR(int l, char c) { return R(s => s, l, c); }
    public INT INT() { return R(long.Parse); }
    public INT[] INT(char c) { return R(long.Parse, c); }
    public INT[] INT(int l) { return R(long.Parse, l); }
    public INT[][] INT(int l, char c) { return R(long.Parse, l, c); }
    public DEC DEC() { return R(double.Parse); }
    public DEC[] DEC(char c) { return R(double.Parse, c); }
    public DEC[] DEC(int l) { return R(double.Parse, l); }
    public DEC[][] DEC(int l, char c) { return R(double.Parse, l, c); }
    public void WRITE(object s, bool lf = true) { W(v => v.ToString(), s, lf); }
    public void FLUSH() { Console.Write(S); S.Length = 0; }
}