EqualPairs

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

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

            int currentSum = 0;
            int previousSum = 0;
            int difference = 0;
            int maxdifference = 0;

            for (int i = 1; i <= n; i++)
            {
                var num1 = int.Parse(Console.ReadLine());
                var num2 = int.Parse(Console.ReadLine());
                currentSum = num1 + num2;

                if (i > 1) // za vsqka dvoika bez pyrvata presmqtaite razlikata s predhodnata:
                {
                    difference = Math.Abs(previousSum - currentSum);
                    if (difference > maxdifference)
                    {
                        maxdifference = difference; // namirame nai-golqmata razlika
                    }
                }
                previousSum = currentSum;
            }

            if (maxdifference == 0) // ako razlikata e 0 znachi vsichki sumi sa ednakvi
            {
                Console.WriteLine("Yes, value={0}", previousSum);
            }

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

        }
    }
}