FoldAndSum

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

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

            int k = inputN.Length / 4;

            int[] leftPart = inputN.Take(k).Reverse().ToArray();
            int[] rightPart = inputN.Reverse().Take(k).ToArray();
            int[] middle = inputN.Skip(k).Take(2 * k).ToArray();

            int[] upper = leftPart.Concat(rightPart).ToArray();

       //   Console.WriteLine(string.Join(" ", leftPart));
       //   Console.WriteLine(string.Join(" ", rightPart));
       //   Console.WriteLine(string.Join(" ", middle));

            for (int i = 0; i < middle.Length; i++)
            {
                middle[i] += upper[i];
            }
            Console.WriteLine(string.Join(" ", middle));
        }
    }
}