PokeMon Don't Go

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

namespace _03.PokemonDon_tGo
{
    public class StartUp
    {
        public static void Main()
        {
            var input = Console.ReadLine()
                .Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
                .Select(int.Parse)
                .ToList();
            int sumOfRemovedElements = 0;
            while (input.Count > 0)
            {
                int valueOfRemovedElement = 0;
                int index = int.Parse(Console.ReadLine());
                if (index < 0)
                {
                    valueOfRemovedElement = input[0];
                    sumOfRemovedElements += valueOfRemovedElement;
                    input[0] = input[input.Count - 1];
                    ChangeValueOfElements(input, valueOfRemovedElement);
                }
                else if (index > input.Count - 1)
                {
                    valueOfRemovedElement = input[input.Count - 1];
                    sumOfRemovedElements += valueOfRemovedElement;
                    input[input.Count - 1] = input[0];
                    ChangeValueOfElements(input, valueOfRemovedElement);
                }
                else
                {
                    valueOfRemovedElement = input[index];
                    sumOfRemovedElements += valueOfRemovedElement;
                    input.RemoveAt(index);
                    ChangeValueOfElements(input, valueOfRemovedElement);
                }
            }
            Console.WriteLine(sumOfRemovedElements);
        }

        private static void ChangeValueOfElements(List<int> input, int valueOfRemovedElement)
        {
            for (int i = 0; i < input.Count; i++)
            {
                if (input[i] <= valueOfRemovedElement)
                {
                    input[i] += valueOfRemovedElement;
                }
                else
                {
                    input[i] -= valueOfRemovedElement;
                }
            }
        }
    }
}