Pairs

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

namespace _2.Pairs
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] array = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
            List<int> sum = new List<int>();
            int currSum = array[0] + array[1];
            if (array.Length == 2 && array[0]==array[1])
            {
                Console.WriteLine("Yes, value={0}", currSum);
                return;
            }
            int nextsum = 0;
            bool areEqual = false;
            bool maxDifference = false;
            int diff = 0;
            int maxDiff = int.MinValue;
            sum.Add(currSum);
            for (int i = 2; i < array.Length; i++)
            {
                nextsum = array[i] + array[i + 1];
                sum.Add(nextsum);

                if (currSum == nextsum)
                {
                    areEqual = true;
                }
                i++;
            }
            if (areEqual)
            {
                Console.WriteLine("Yes, value={0}", nextsum);
                return;
            }
            for (int i = 0; i < sum.Count-1; i++)
            {
                diff = Math.Abs(sum[i] - sum[i+1]);
                if (diff > maxDiff)
                {
                    maxDiff = diff;
                    maxDifference = true;
                }
            }
            if (maxDifference)
            {
                Console.WriteLine("No, maxdiff={0}", maxDiff);
            }
        }
    }
}