namespace ConsoleApp1;

using System.Text;

public class Task11
{
    public void Run()
    {
        Console.InputEncoding = Encoding.Unicode;
        Console.OutputEncoding = Encoding.Unicode;

        Random random = new Random();
        int includedLowBound = 0;
        int excludedHighBound = 100;
        int number = random.Next( includedLowBound, excludedHighBound );

        int divider1 = 3;
        int divider2 = 5;

        Console.WriteLine($"Случайное число : {number}");

        int sum = 0;

        for ( int i = 0; i <= number; i++ )
        {
            bool canAddToSum = (i % divider1 == 0) || (i % divider2 == 0);

            if ( canAddToSum )
                sum += i;
        }

        Console.WriteLine( $"Сумма чисел, меньших, чем {number} (включительно), и кратных {divider1} или {divider2} равна {sum}" );
    }
}