using System;

namespace _02.Pairs
{
    class Program
    {
        static void Main()
        {
            string[] input = Console.ReadLine().Split(' ');
            int maxDiff = 0;
            int oldPair = 0;
            int valueOne = 0;
            int valueTwo = 0;
            int currentPair = 0;
            for (int i = 0, k = 0; i < input.Length / 2; i++, k += 2)
            {
                valueOne = int.Parse(input[k]);
                valueTwo = int.Parse(input[k + 1]);
                oldPair = currentPair;
                currentPair = valueOne + valueTwo;
                if (i != 0 && currentPair != oldPair)
                {
                    int diff = Math.Abs(currentPair - oldPair);
                    if (diff > maxDiff)
                    {
                        maxDiff = diff;
                    }
                }
                else
                {
                    oldPair = currentPair;
                }
            }
            if (maxDiff != 0)
            {
                Console.WriteLine("No, maxdiff=" + maxDiff);
            }
            else
            {
                Console.WriteLine("Yes, value=" + (valueOne + valueTwo));
            }
        }
    }
}