using System;

public class Program

{

    public static void Main()

    {

        var rand = new Random();

        double chance = 0.35;

        int smileyCount = 0;

        for (int i = 0; i < 100; i++)

        {

        if (rand.NextDouble() <= chance) 

        { 

            Console.Write(":) ");   

            smileyCount++;

        }

        else

            Console.Write("[] ");

        }

        Console.WriteLine();

        Console.WriteLine("Num smileys: " + smileyCount);

    }

​

}