using System;


class Pairs
{
    static void Main()
    {
        string input = Console.ReadLine();

        int counter = 0;

        string firstInteger = "";
        string secondInteger = "";
        int maxDiff = 0;
        int? sum1 = null;
        int? sum2 = null;

        while(counter<input.Length)
        {
            firstInteger = "";
            secondInteger = "";

            while (input[counter]!=' ')
            {
                firstInteger = firstInteger + input[counter];
                counter++;
            }

            counter++;

            while (counter<input.Length && input[counter]!=' ')
            {
                secondInteger = secondInteger + input[counter];
                counter++;
            }

            counter++;
            sum2 = int.Parse(secondInteger) + int.Parse(firstInteger);

            if (sum1!=null)
            {
                maxDiff = Math.Max(maxDiff,Math.Abs((int)sum2 - (int)sum1));
            }

            sum1 = sum2;

        }

        if (maxDiff==0)
        {
            Console.WriteLine("Yes, value={0}",sum2);
        }
        else
        {
            Console.WriteLine("No, maxdiff={0}",maxDiff);
        }
    }
}