FoldAndSum

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

namespace FoldAndSum
{
    class FoldAndSum
    {
        static void Main(string[] args)
        {
            int[] inputArray = Console.ReadLine().Split().Select(int.Parse).ToArray();

            int sizeOfAQuarter = inputArray.Length / 4;
            int newArraysLengh = inputArray.Length / 2;
            int[] foldedEndsOfTheInputArr = new int[newArraysLengh];

            for (int firstHalfElement = 0, secondHalfElement = (foldedEndsOfTheInputArr.Length / 2); firstHalfElement < sizeOfAQuarter; firstHalfElement++, secondHalfElement++)
            {
                foldedEndsOfTheInputArr[firstHalfElement] = inputArray[sizeOfAQuarter - 1 - firstHalfElement];
                foldedEndsOfTheInputArr[secondHalfElement] = inputArray[inputArray.Length - 1 - firstHalfElement];
            }

            int[] resultArray = new int[newArraysLengh];
            for (int currElement = 0; currElement < foldedEndsOfTheInputArr.Length; currElement++)
            {
                resultArray[currElement] = foldedEndsOfTheInputArr[currElement] + inputArray[sizeOfAQuarter + currElement];
            }

            Console.WriteLine(string.Join(" ", resultArray));
        }
    }
}