Pairs

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

class P02Pairs
{
    static void Main()
    {
        string str = Console.ReadLine();
        string[] numbers = str.Split(' ');
        List<int> nums = new List<int>();
        List<int> sums = new List<int>();
        List<int> diffs = new List<int>();
        bool equals = true;
        int sum = 0;
        int diff = 0;
        foreach (string n in numbers)
        {
            int number = int.Parse(n);
            nums.Add(number);
        }
        for (int i = 0; i < nums.Count - 1; i += 2)
        {
            sum = nums[i] + nums[i + 1];
            sums.Add(sum);
        }
        for (int i = 0; i < sums.Count - 1; i++)
        {
            if (sums[i] != sums[i + 1])
            {
                equals = false;
            }
        }
        if (equals == true)
        {
            Console.WriteLine("Yes, value={0}", sums[0]);
        }
        else if (equals == false)
        {
            for (int i = 0; i < sums.Count - 1; i++)
            {
                diff = Math.Abs(sums[i] - sums[i + 1]);
                diffs.Add(diff);
            }
            Console.WriteLine("No, maxdiff={0}", diffs.Max());
        }
    }
}