using System;
using System.Linq;

class Pairs
{
    static void Main()
    {
        string[] strNumbers = Console.ReadLine().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
        int[] inputNumbers = Array.ConvertAll<string, int>(strNumbers, int.Parse);
        int[] sums = new int[inputNumbers.Length / 2];
        for (int i = 0, j = 0; i < inputNumbers.Length / 2; i++, j += 2)
        {
            sums[i] = inputNumbers[j] + inputNumbers[j + 1];
        }
        if (sums.Max() == sums.Min())
        {
            Console.WriteLine("Yes, value={0}", sums[0]);
        }
        else
        {
            Console.WriteLine("No, maxdiff={0}", Math.Abs(sums.Max() - sums.Min()));
        }
    }
}