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 void Main()
    {
        int N, M;
        string[] S = Console.ReadLine().Split(' ');
        N = int.Parse(S[0]);
        M = int.Parse(S[1]);
        if ((N == 1 && M == 2) || (M == 1 && N == 2))
        {
            Console.WriteLine("YES");
            return;
        }
        if (N == 1 || M == 1)
        {
            Console.WriteLine("NO");
            return;
        }
        if (N % 2 == 0 || M % 2 == 0)
        {
            Console.WriteLine("YES");
        }
        else
        {
            Console.WriteLine("NO");
        }
    }
}