internal class Program
{
    private static void Main(string[] args)
    {
        var student = new Student(22, "Jan Kowalski", new() { 4, 4, 5 });
        student.Hello();
        var elementaryStudent = new ElementaryStudent(14, "Anna Nowak", new() { 5, 5, 5 }, 32);
        elementaryStudent.Hello(); // Elementary Student nie implementuje swoje Hello, więc wywoła się metoda z klasy bazowej
        var universityStudent = new UniversityStudent(23, "John Doe", new() { 3, 3, 3 }, "C# jest super");
        universityStudent.Hello(); // ta klasa robi override metody virtualnej, więc wywoła się implementacja z klasy pochodnej
    }
}
public class Student
{
    public int Age { get; set; }
    public string Name { get; set; }
    public List<int> Grades { get; set; }
    public Student(int age, string name, List<int> grades)
    {
        Age = age; Name = name; Grades = grades;
    }
    public virtual void Hello()
    {
        Console.WriteLine($"My name is {Name}. My age is {Age}. My best grade is {Grades.Max()}");
    }
}

public class ElementaryStudent : Student
{
    public int UniformSize { get; set; }
    public ElementaryStudent(int age, string name, List<int> grades, int uniformSize) 
        :base(age, name, grades)
    {
        UniformSize = uniformSize;
    }
}

public class UniversityStudent : Student
{
    public string ThesisTitle { get; set; }
    public UniversityStudent(int age, string name, List<int> grades, string thesisTitle):
        base(age, name, grades)
    {
        ThesisTitle = thesisTitle;
    }

    public override void Hello()
    {
        Console.WriteLine($"I'm from university. My thesis title is {ThesisTitle}");
    }
}