Problem 2. Pokemon Don’t Go

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

class MoreExercises
{
    static void Main()
    {
        var seqInt = Console.ReadLine().Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToArray();
        var listToSum = new List<int>();
        var removedInt = 0;
        while (true)
        {
            int index = int.Parse(Console.ReadLine());
            if (index < 0)
            {
                removedInt = seqInt[0];
                listToSum.Add(removedInt);
                seqInt[0] = seqInt[seqInt.Length - 1];
                for (int i = 0; i < seqInt.Length; i++)
                {
                    if (seqInt[i] <= removedInt)
                    {
                        seqInt[i] = seqInt[i] + removedInt;
                    }
                    else if (seqInt[i] > removedInt)
                    {
                        seqInt[i] = seqInt[i] - removedInt;
                    }
                }
            }
            else if (index > seqInt.Length - 1)
            {
                removedInt = seqInt[seqInt.Length - 1];
                listToSum.Add(removedInt);
                seqInt[seqInt.Length - 1]= seqInt[0];
                for (int i = 0; i < seqInt.Length; i++)
                {
                    if (seqInt[i] <= removedInt)
                    {
                        seqInt[i] = seqInt[i] + removedInt;
                    }
                    else if (seqInt[i] > removedInt)
                    {
                        seqInt[i] = seqInt[i] - removedInt;
                    }
                }
            }
            else
            {
                removedInt = seqInt[index];
                listToSum.Add(removedInt);
                seqInt = seqInt.Where(x => x != seqInt[index]).ToArray();
                for (int i = 0; i < seqInt.Length; i++)
                {
                    if (seqInt[i] <= removedInt)
                    {
                        seqInt[i] = seqInt[i] + removedInt;
                    }
                    else if (seqInt[i]>removedInt)
                    {
                        seqInt[i] = seqInt[i] - removedInt;
                    }
                }
            }
            if (seqInt.Length==0)
            {
                break;
            }
        }
        Console.WriteLine(listToSum.Sum());
    }
}