using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<String> images = new List<String>(){"a", "b", "c"};

        int imageCount = images.Count; //3 to start

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

        {

            Console.WriteLine($"{i} {imageCount}");

            images.AddRange(images);

        }

    }

}