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

public class Program
{
    public static void Main() {
        string[] d = Console.ReadLine().Split(' ');
        int N = int.Parse(d[0]);
        int M = int.Parse(d[1]);

        string re = "";
        if (N == 1 || M == 1) {
            if (N == 2 || M == 2) {
                re = "YES";
            }
            else {
                re = "NO";
            }

        }
        else {
            re = N % 2 == 1 && M % 2 == 1 ? "NO" : "YES";
        }
        Console.WriteLine(re);
    }
}