static void Main(string[] args)
{
RegistrationBook registrationBook = new RegistrationBook();
registrationBook.RegisterPerson("Ana", "Popescu", Gender.Female);
registrationBook.RegisterPerson("Nadia", "Comanici", Gender.Female);
registrationBook.RegisterPerson("Marian", "Ionescu", Gender.Male);
registrationBook.RegisterPerson("Vasile", "Pop", Gender.Male);
registrationBook.RegisterPerson("Ana", "Andreica", Gender.Female);
Console.WriteLine($"There are {registrationBook.CountFemales()} registered women.");
Console.WriteLine($"There are {registrationBook.CountMales()} registered men.");
}
}