Equal Pairs

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

namespace DomashnoEqualPairs
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());

            int numberOfInputs = n * 2;

            int coupleSum1 = 0;

            int coupleSum2 = 0;

            int lastDifference = 0;

            int maxDifference = 0;


            for (int i = 1; i <= n; i++)
            {
                int input = int.Parse(Console.ReadLine());
                int input2 = int.Parse(Console.ReadLine());

                if (i % 2 == 1 && n != 1)
                {
                    coupleSum1 = input + input2;
                }
                else if(i % 2 == 0 && n != 1)
                {
                    coupleSum2 = input + input2;
                }
                else
                {
                    coupleSum1 = input + input2;
                    coupleSum2 = 0;
                }

                int difference = Math.Abs(coupleSum1 - coupleSum2);
                if (difference > maxDifference&&i>1)
                {
                    maxDifference = difference;
                    lastDifference = difference;
                }


            }

            if (maxDifference == 0)
            {
                Console.WriteLine($"Yes, value={coupleSum1}");
            }
            else
            {
                Console.WriteLine($"No, maxdiff={lastDifference}");
            }




        }
    }
}