static void Main(string[] args) { var people = new List <Person>(); var milosu = new Person("Milos Zeman", 75, "president"); people.Add(milosu); var mark = new Person("Mark", 46, "male"); people.Add(mark); var jane = new Person(); people.Add(jane); var john = new Student("John Doe", 20, "male", "BME"); people.Add(john); var johnTheClone = john.Clone() as Student; people.Add(johnTheClone); var student = new Student(); people.Add(student); var gandhi = new Mentor("Gandhi", 148, "male", Experience.Senior); people.Add(gandhi); var mentor = new Mentor(); people.Add(mentor); var sponsor = new Sponsor(); people.Add(sponsor); var elon = new Sponsor("Elon Musk", 46, "male", "SpaceX"); people.Add(elon); student.SkipDays(3); for (int i = 0; i < 5; i++) { elon.Hire(); } for (int i = 0; i < 3; i++) { sponsor.Hire(); } foreach (var person in people) { person.Introduce(); person.GetGoal(); } Cohort awesome = new Cohort("AWESOME"); awesome.AddStudent(student); awesome.AddStudent(john); awesome.AddMentor(mentor); awesome.AddMentor(gandhi); awesome.Info(); Console.ReadKey(); }