4.Еднакви двойки

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

namespace _4.Еднакви_двойки
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            double sumEven = 0;
            double sumOdd = 0;
            double diff = -3333333;
            double max = int.MinValue;

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

                if (i % 2 == 0)
                {
                    sumEven = num1 + num2;
                }
                else
                {
                    sumOdd = num1 + num2;
                }

                if (i == 1)
                {
                    diff = 0;
                }

                else if (i >= 2)
                {
                    diff = Math.Abs(sumEven - sumOdd);

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

            }

            if (diff == 0)
            {
                Console.WriteLine($"Yes, value={sumOdd}");
            }
            else
            {
                Console.WriteLine($"No, maxdiff={max}");
            }
        }
    }
}