using System;

public class Hello
{
    public static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = int.Parse(line[0]);
        var m = int.Parse(line[1]);
        Console.WriteLine(getAns(n, m) ? "YES" : "NO");
    }
    public static bool getAns(int n, int m)
    {
        if (n == 1 | m == 1) return true;
        if (n % 2 == 0 | m % 2 == 0) return true;
        return false;
    }
}