using System;
using System.Linq;
using static System.Console;

class program{
	static void Main(){
		var input=ReadLine().Split(' ')
          .Select(s=>int.Parse(s)).ToList();
        
      
       input.Sort();
      var sorted=input;
      
       if(sorted[0]+sorted[1]==sorted[2]){
         WriteLine("yes");
       }else{
         WriteLine("No");
       }
	}
}