using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = int.Parse(line[0]);
        var b = int.Parse(line[1]);
        Console.WriteLine((a == b | (a == 2 && b == 4) | (a == 4 && b == 2)) ? "Yes" : "No");
    }
}