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

namespace Testing
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Please input time to countdown: ");
            string input = Console.ReadLine(); //getting input form the user

            int inputInt = 0;
            int.TryParse(input, out inputInt); //parse the string into an int

            DateTime old = DateTime.Now; //get current time

            Console.WriteLine(inputInt); //output the number the user started with
            inputInt--; //decrement the counter

            for (; inputInt >= 0;) //loop till the counter is 0
            {
                //the only tricky bit, get the current time and subtract the time you started at
                //check if this difference is 1 second or more
                if (DateTime.Now.Subtract(old) >= new TimeSpan(0, 0, 1))
                {
                    //if it is 1 second or more
                    Console.WriteLine(inputInt); //write the next number
                    inputInt--; //decrement counter
                    old = DateTime.Now; //update the timer
                }
            }

            Console.WriteLine("End"); //print end
        }
    }
}