using System; namespace No240_1{ public class Program{ public static void Main(string[] args){ var sr = new StreamReader(); //--------------------------------- var x = sr.Next(); var y = sr.Next(); var dx = new[]{-2, -2, -1, -1, +1, +1, +2, +2}; var dy = new[]{-1, +1, -2, +2, -2, +2, -1, +1}; Func dfs = null; dfs = (cnt, tx, ty) =>{ if(x == tx && y == ty) return true; if(cnt >= 3) return false; var result = false; for(var i = 0; i < 8; i++){ result |= dfs(cnt + 1, tx + dx[i], ty + dy[i]); } return result; }; Console.WriteLine(dfs(0, 0, 0) ? "YES" : "NO"); //--------------------------------- } } public class StreamReader{ private readonly char[] _c = {' '}; private int _index = -1; private string[] _input = new string[0]; public T Next(){ if(_index == _input.Length - 1){ _index = -1; while(true){ var rl = Console.ReadLine(); if(rl == null){ if(typeof(T).IsClass) return default(T); return (T)typeof(T).GetField("MinValue").GetValue(null); } if(rl != ""){ _input = rl.Split(_c, StringSplitOptions.RemoveEmptyEntries); break; } } } return (T)Convert.ChangeType(_input[++_index], typeof(T), System.Globalization.CultureInfo.InvariantCulture); } public T[] Next(int x){ var result = new T[x]; for(var i = 0; i < x; ++i){ result[i] = Next(); } return result; } public T[,] Next(int y, int x){ var result = new T[y, x]; for(var i = 0; i < y; ++i){ for(var j = 0; j < x; ++j){ result[i, j] = Next(); } } return result; } } }