using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Random n = new Random();

        int coinToss;

        int heads = 0;

        int tails = 0;

        int numCoinToss = 0;

        Console.WriteLine("How many coin tosses should we do?  ");

        numCoinToss = Int32.Parse(Console.ReadLine());

        for(int i = 0; i < numCoinToss; i++)

        {

            coinToss = n.Next() % 2;

            if (coinToss == 0)

            {

                heads++;

            }

            else

            {

                tails++;

            }

        }

        if (numCoinToss == 0)

        {

            Console.WriteLine("Error:  Zero coin tosses.");

        }

        else

        {

            double countTotal = (double)numCoinToss;

            Console.WriteLine("Heads:  " + ((100*heads) / countTotal ).ToString()+"% Tails:  " + ((100*tails) / countTotal).ToString() + "%");

        }

        Console.WriteLine("Press enter to continue.");

        Console.ReadLine();

    }

}