Pairs

class Pairs
    {
        static void Main()
        {
            int[] inputNumbers = Console.ReadLine().Split(new char[] { }, StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToArray();

            List<int> sums = new List<int>();

            for (int i = 0; i < inputNumbers.Length / 2; i++)
            {
                sums.Add(inputNumbers[i * 2] + inputNumbers[(i * 2) + 1]);
            }

            if (sums.Max() == sums.Min())
            {
                Console.WriteLine("Yes, value={0}", sums[0]);
            }
            else
            {
                int maxdiff = 0;
                int prevValue = 0;
                for (int i = 0; i < sums.Count - 1; i++)
                {
                    int firstElement = sums.ElementAt(i);
                    int secondElement = sums.ElementAt(i + 1);
                    int diff = Math.Abs(firstElement - secondElement);
                    maxdiff = Math.Max(diff, maxdiff);
                }

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