class Person {

    //protected gir alle subklasser tilgang til variablene
    protected String navn;
    protected int alder;

    public void skrivInfo(){
        System.out.println("Jeg er en Person!");
    }
    public int hentAlder(){
        return alder;
    }
}

class Student extends Person{

    protected int studentNr;

    public void skrivInfo(){
        System.out.println("Jeg er en Student");
    }
}

class Underviser extends Person{

    protected int underviserNr;

    public void skrivInfo(){
        System.out.println("Jeg er en Underviser!");
    }
}

class Masterstudent extends Student{

    protected String masterprogram;

    public void skrivInfo(){
        System.out.println("Jeg er en Masterstudent");
    }
}