EqualPairs

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

namespace EqualPairsa
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int sum = 0;
            int maxDiff = 0;
            int sum2 = 0;
            int num1;
            int num2;
            int sumNew = 0;
            int sumMax = int.MinValue;
            int maxDiffNew = 0;
            int sumMin = int.MaxValue;
            int num3 = int.Parse(Console.ReadLine());
            int num4 = int.Parse(Console.ReadLine());
            sum2 = num3 + num4;
            int sumTotal = 0;
            for (int i = 0; i < n - 1; i++)
            {
                for (int j = 0; j < 1; j++)
                {
                    num1 = int.Parse(Console.ReadLine());
                    num2 = int.Parse(Console.ReadLine());

                    sum = num1 + num2;
                }
                if (Math.Max(sum2, sum) > sumMax)
                    sumMax = Math.Max(sum2, sum);
                sumMin = Math.Min(sum2, sum);
                maxDiff = Math.Abs(sumMax - sumMin);

                if ((sum2 - sum) == 0)
                {
                    sum2 = sum;
                }
                else
                {
                    if (maxDiff >= maxDiffNew)
                    {
                        maxDiffNew = maxDiff;
                    }
                }
            }
            if (maxDiffNew == 0)
            {
                Console.WriteLine("Yes, value=" + sum2);
            }
            else
            {
                Console.WriteLine("No, maxDiff=" + maxDiffNew);
            }
        }
    }
}