Last Task -- Equal Pairs

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

namespace _12_Equal_Pairs
{
    class Program
    {
        static void Main(string[] args)
        {
            var n = int.Parse(Console.ReadLine());
            var sum = 0;
            var sumPrev = 0;
            var diff = 0;
            var diffMax = 0;

            for (var i = 1; i <= n; i++)
            {
                sumPrev = sum;
                var numOne = int.Parse(Console.ReadLine());
                var numTwo = int.Parse(Console.ReadLine());
                sum = numOne + numTwo;

            }
            for (var j = 2; j <= n; j++)
            {
                diff = Math.Abs(sum - sumPrev);
                if (diff > diffMax)
                {
                    diffMax = diffMax + diff;
                }
            }

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


        }
    }
}