using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        //versionOne();

        versionTwo();

    }

    public static void versionOne()

    {

        var sampleRate = 2;

        for (var i = 1; i <= 50; i++)

        {

            if (i % 10 < sampleRate) Console.WriteLine(i);

        }

    }

    public static void versionTwo()

    {

        var sampleRate = 5;

        for (var i = 1; i <= 50; i++)

        {

            var min = (i - 1) / 10 * 10 + 1;

            var max = min + 9;

            if (pick(min, max, sampleRate).Contains(i))

            {

                Console.WriteLine(i);

            }

        }

    }

    public static IEnumerable<int> pick(int min, int max, int quantity)

    {

        var source = Enumerable.Range(min, max - min + 1);

        var random = new Random(min);

        for (var i = 0; i < quantity; i++)

        {

            var item = source.ElementAt(random.Next(source.Count()));

            yield return item;

            source = source.Except(new [] { item });

        }

    }

}