Console.WriteLine(
                String.Format("Prime numbers count:{0}",
                Enumerable
                .Range(
                    int.Parse(ConsoleEx.ReadLineEx("Valery, please, input Left limit:")),
                    int.Parse(ConsoleEx.ReadLineEx("Valery, please, input Right limit:"))
                )
                .Where(item =>
                {
                    var aux = item;

                    while (--item > 1)
                        if (aux % item == 0)
                            return false;

                    Console.WriteLine($"Prime number:{aux}");
                    return true;
                })
                .Count()
                )
            );