using System;

public class Program

{

    public static void Main()

    {

        Random rand = new Random();

        double percentage = rand.NextDouble();

        string[] greetings = new[] { "Hi", "Hello", "Howdy!", "Hey" };

        string[] smilies = new[] { ";)", ":)", "=)", ":-)" };

        // Get a greeting

        string greet = greetings[rand.Next(0, greetings.Length)];

        // Generate the smiley index using the probablity percentage

        int randomIndex = rand.Next(0, (int)(smilies.Length / percentage));

        // Get a smiley if the generated index is within the bound of the smilies array

        string smile = randomIndex < smilies.Length ? smilies[randomIndex] : String.Empty;

        Console.WriteLine("{0} {1}", greet, smile);

    }

}