Equal Pairs

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

namespace _04EqualPairs
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());

            int sum = 0;
            int prevSum = 0;
            int diff = 0;
            int maxDiff = 0;

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

                if (i>1)
                {

                 diff = Math.Abs(sum - prevSum);
                }

                if (diff>maxDiff)
                {
                    maxDiff = diff;
                }

                prevSum = sum;
                sum = 0;
            }

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