List-Ex/List Operations

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

namespace fundamental14
{
    class MainClass
    {
        public static void Main()
        {
            List<int> originalList = Console.ReadLine().Split().Select(int.Parse).ToList();

            string input = string.Empty;

            while((input = Console.ReadLine()) != "End")
            {
                string[] arr = input.Split();
                string command = arr[0];
                int number = 0;
                int index = 0;

                if (command == "Add")
                {
                    number = int.Parse(arr[1]);
                    originalList.Add(number);
                }
                else if(command == "Insert")
                {
                    number = int.Parse(arr[1]);

                    index = int.Parse(arr[2]);

                    if (index >= originalList.Count || index < 0)
                    {
                        Console.WriteLine("Invalid index");
                    }
                    else
                    {
                        originalList.Insert(index, number);
                    }

                }
                else if (command == "Remove")
                {
                    index = int.Parse(arr[1]);
                    if (index >= originalList.Count || index < 0)
                    {
                        Console.WriteLine("Invalid index");
                    }
                    else
                    {
                        originalList.RemoveAt(index);
                    }
                }
                else if (command == "Shift")
                {
                    string direction = arr[1];
                    int count = int.Parse(arr[2]);
                    if (direction == "left")
                    {
                        for (int j = 0; j < count; j++)
                        {
                            int current = originalList[0];

                             for (int i = 0; i < originalList.Count - 1; i++)
                             {
                                  originalList[i] = originalList[i + 1];
                             }
                             originalList[originalList.Count - 1] = current;
                        }
                    }
                    else
                    {
                        for (int j = 0; j < count; j++)
                        {
                            int current = originalList[originalList.Count - 1];

                             for (int i = originalList.Count - 1; i > 0; i--)
                             {
                                  originalList[i] = originalList[i - 1];
                             }
                             originalList[0] = current;
                        }
                    }
                }
            }

            Console.WriteLine(string.Join(" ", originalList));
        }
    }
}