using System;

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