using System;
using System.Linq;
using System.Collections.Generic;
class Program
{
    static void Main()
    {
        var input = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToList();
        input.Sort((x, y) => y - x);
        if (input[0] == input[1] + input[2])
        {
            Console.WriteLine("YES");
        }
        else
        {
            Console.WriteLine("NO");
        }
    }
}