using System;

public class Program

{

    public static void Main()

    {

        int n = int.Parse(Console.ReadLine());

        double num1 = double.Parse(Console.ReadLine());

        double num2 = double.Parse(Console.ReadLine());

        double sum = num1+num2;

        double diff = 0;

        double lastSum = 0;

        double lastDiff = 0;

        double maxDiff = double.MinValue;

        int counter = 1;

        for (double i = 1; i<n; i++)

        {

            lastSum = sum;

            num1 = double.Parse(Console.ReadLine());

            num2 = double.Parse(Console.ReadLine());

            sum = num1+num2;

            if(sum == lastSum)

            {

                counter++;

            }

            else

            {

                lastDiff = diff;

                diff = Math.Abs(sum - lastSum);

                 if (diff > lastDiff)

                    {

                        maxDiff = diff;

                    }

            }

        }

        if (counter==n)

            {

                Console.WriteLine("Yes, value={0}",sum);

            }

            else

            {

                Console.WriteLine("No, maxdiff={0}",maxDiff);

            }

    }

}