using System;
using System.Linq;

class Program85
{
    public static void Main(string[] args)
    {
        var line = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
        int n = line[0];
        int m = line[1];
        if (n == 1)
        {
            if (m == 2)
            {
                Console.WriteLine("YES");
                return;                
            }
            Console.WriteLine("NO");
            return;
        }
        if (m == 1)
        {
            if (n == 2)
            {
                Console.WriteLine("YES");
                return;
            }
            Console.WriteLine("NO");
            return;
        }
        {
            int x = 1;
            for (int y = 0; y < m; y++)
            {
                if (x == 1)
                {
                    x = n - 1;
                }
                else
                {
                    x = 1;
                }
            }
            if (x == 1)
            {
                Console.WriteLine("YES");
                return;
            }            
        }
        {
            int y = 1;
            for (int x = 0; x < n; x++)
            {
                if (y == 1)
                {
                    y = m - 1;
                }
                else
                {
                    y = 1;
                }
            }
            if (y == 1)
            {
                Console.WriteLine("YES");
                return;
            }                        
        }
        Console.WriteLine("NO");
    }    
}