Pokemon Don't Go

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

namespace PokemonDon_tGo
{
    class Program
    {
        static void Main()
        {
            List<int> pokemons = Console.ReadLine()
                .Split()
                .Select(int.Parse)
                .ToList();

            int sumOfRemovedElements = 0;

            while (pokemons.Count > 0)
            {
                int index = int.Parse(Console.ReadLine());

                if (index < 0)
                {
                    var removedNumberCase1=pokemons[0];
                    sumOfRemovedElements += removedNumberCase1;
                    pokemons[0]=pokemons[pokemons.Count - 1];
                    for (int i = 0; i < pokemons.Count; i++)
                    {
                        if (pokemons[i] <= removedNumberCase1)
                        {
                            pokemons[i] += removedNumberCase1;
                        }
                        else
                        {
                            pokemons[i] -= removedNumberCase1;
                        }
                    }
                }
                else if (index >= pokemons.Count)
                {
                    var removedNumberCase2=pokemons[pokemons.Count - 1];
                    sumOfRemovedElements += removedNumberCase2;
                    pokemons[pokemons.Count - 1]=pokemons[0];
                    for (int i = 0; i < pokemons.Count; i++)
                    {
                        if (pokemons[i] <= removedNumberCase2)
                        {
                            pokemons[i] += removedNumberCase2;
                        }
                        else
                        {
                            pokemons[i] -= removedNumberCase2;
                        }
                    }
                }
                else
                {
                    var removedNumberCase3=pokemons[index];
                    sumOfRemovedElements += removedNumberCase3;
                    pokemons.RemoveAt(index);

                    for (int i = 0; i < pokemons.Count; i++)
                    {
                        if (pokemons[i] <= removedNumberCase3)
                        {
                            pokemons[i] += removedNumberCase3;
                        }
                        else
                        {
                            pokemons[i] -= removedNumberCase3;
                        }
                    }
                }
            }
            Console.WriteLine(sumOfRemovedElements);
        }
    }
}