Altitude от Simple Arrays

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

namespace simpleArrays
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> input = Console.ReadLine().Split().ToList();
            long altitude = long.Parse(input[0]);
            List<string> commands = getCommands(input);

            for (int i = 0; i < commands.Count; i++)
            {
                string[] comm = commands[i].Split();
                string upOrDown = comm[0];
                long Count = long.Parse(comm[1]);
                if (upOrDown.Equals("up"))
                {
                    altitude += Count;
                }
                else
                {
                    altitude -= Count;
                }

                if (altitude <= 0)
                {
                    Console.WriteLine("crashed");
                    break;
                }
            }

            if (altitude > 0)
            {
                Console.WriteLine("got through safely. current altitude: {0}m",altitude);
            }

        }

        private static List<string> getCommands(List<string> input)
        {
            List<string> a = new List<string>();
            for (int i = 1; i < input.Count; i+=2)
            {
                a.Add(input[i] + " " + input[i + 1]);
            }
            return a;
        }
    }
}