FoldAndSum

using System;
using System.Collections.Generic;
using System.Linq;

namespace FoldAndSum
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            List<int> numbers = Console.ReadLine().Split().Select(int.Parse).ToList();
            List<int> leftEnd = new List<int>();
            List<int> rigthEnd = new List<int>();
            List<int> middle = new List<int>();
            List<int> sumResult = new List<int>();
            int middleLength = numbers.Count / 2;
            int endLength = numbers.Count / 4;
            for (int i = numbers.Count-(middleLength+endLength+1); i >= 0; i--)
            {
                leftEnd.Add(numbers[i]);
            }

            for (int i = numbers.Count-1; i >=middleLength+ endLength; i--)
            {
                rigthEnd.Add(numbers[i]);
            }

            for (int i = endLength; i < endLength+middleLength; i++)
            {
                middle.Add(numbers[i]);
            }

            var listLeftAndRightEnds = leftEnd.Concat(rigthEnd).ToList();
            for (int i = 0; i < middle.Count; i++)
            {
                sumResult.Add(listLeftAndRightEnds[i] + middle[i]);
            }

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