My code, why is not working?

using System;
using System.Text.RegularExpressions;
using System.IO;
using System.Collections.Generic;
using System.Linq;

namespace Timus
{
    class Program
    {
        static void Main(string[] args)
        {
            //Console.SetIn(File.OpenText("input.txt"));

            int n = Convert.ToInt32(Console.ReadLine());
            int[] numbers = new int[20];
            numbers = Array.ConvertAll(Console.ReadLine().Split(' '), int.Parse);

            int sumLeft = numbers.Max();
            numbers = pullMaxValueArray(numbers);

            int sumRight = numbers.Max();
            numbers = pullMaxValueArray(numbers);

            while(numbers.Length > 0)
            {
                int maxValue = numbers.Max();
                numbers = pullMaxValueArray(numbers);
                if (sumLeft < sumRight)
                {
                    sumLeft += maxValue;
                } else
                {
                    sumRight += maxValue;
                }
            }

            Console.WriteLine(Math.Abs(sumLeft - sumRight));
        }

        public static int [] pullMaxValueArray(int[] array)
        {
            int maxValue = array.Max();
            int maxIndex = array.ToList().IndexOf(maxValue);
            array = array.Where((source, index) => index != maxIndex).ToArray();
            return array;
        }
    }
}

You do not consider inputs like:
1
1