task7

using System;

public class Program
{
    public static void Main(string[] args)
    {
        Random random = new Random();

        int numberRandomStart = 1;
        int numberRandomEnd = 27;

        int numberRandom = random.Next(numberRandomStart, numberRandomEnd);

        double numberStart = 100;
        double numberEnd = 999;

        int numberCount = 0;

        for (int numberTotal = numberRandom; numberTotal <= numberEnd; numberTotal += numberRandom)
            if (numberTotal >= numberStart)
                ++numberCount;

        Console.WriteLine("Start number random is : " + numberRandomStart);
        Console.WriteLine("End number random is : " + numberRandomEnd);
        Console.WriteLine("Random number is : " + numberRandom);
        Console.WriteLine("Amount of multiples of three-digit numbers  : " + numberCount);
    }
}