Condense Array to Number or Middle Elements

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

namespace _09_Middle_Elements
    {
    class MiddleElements
        {
        static void Main(string[] args)
            {
            int[] numbers = Console.ReadLine().Split().Select(int.Parse).ToArray();
            int len = numbers.Length;


            do
                {
                for (int i = 0; i < len - 1; i++)
                    {
                    numbers[i] = numbers[i] + numbers[i + 1];
                    }
                len--;
                } while (len>1);

            Console.WriteLine(numbers[0]);

            }
        }
    }