using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EqualNumbers
{
    class Program
    {
        static void Main(string[] args)
        {
            var count = int.Parse(Console.ReadLine());
            double previousPairSum = 0;
            double currentPairSum = 0;
            double difference = 0;
            double biggestdifference = 0;
            for (int i = 0; i < count; i++)
            {
                var num1 = int.Parse(Console.ReadLine());
                var num2 = int.Parse(Console.ReadLine());
                if (i == 0)
                {
                    previousPairSum = num1 + num2;
                }
                else
                {
                    currentPairSum = num1 + num2;
                    difference = Math.Abs(currentPairSum - previousPairSum);
                    if (difference > biggestdifference)
                    {
                        difference = biggestdifference;
                    }
                    previousPairSum = currentPairSum;
                }
                if (biggestdifference == 0)
                {
                    Console.WriteLine("Yes, value = {0}", previousPairSum);
                }
                else
                {
                    Console.WriteLine("No, diff = {0}", biggestdifference);
                }
            }
        }
    }
}