Test #11 (Runtime error)

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

namespace _05.Array_Manipulator
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> list = Console.ReadLine().Split(' ').Select(int.Parse).ToList();
            while (true)
            {
                List<string> command = Console.ReadLine().Split(' ').ToList();

                switch (command[0])
                {
                    case "print":
                        Console.WriteLine("["+String.Join(", ",list)+"]");
                        return;

                    case "add":
                        int index = int.Parse(command[1]);
                        int element = int.Parse(command[2]);
                        list.Insert(index,element);
                        break;

                    case "addMany":

                        for (int i = 0; i < command.Count-2; i++)
                        {
                            list.Insert(int.Parse(command[1]) + i, int.Parse(command[i + 2]));
                        }
                        break;

                    case "contains":
                        Console.WriteLine(list.IndexOf(int.Parse(command[1])));
                        break;

                    case "remove":
                        list.RemoveAt(int.Parse(command[1]));
                        break;

                    case "shift":
                        int position = int.Parse(command[1]);
                        for (int i = 0; i < position; i++)
                        {
                            list.Add(list[0]);
                            list.RemoveAt(0);
                        }
                        break;

                    case "sumPairs":
                        for (int i = 0; i < list.Count; i++)
                        {
                            int currSum = list[i]+list[i+1];
                            list.RemoveAt(i+1);
                            list.RemoveAt(i);
                            list.Insert(i,currSum);
                        }
                        break;
                }

            }

        }
    }
}