abstract class LevendeTing {
    protected int alder;

    public int hentAlder() {
        return alder;
    }


    public abstract boolean erLevende();
}

class Person extends LevendeTing {
    protected String personNr;

    public String hentPersonNr() {
        return personNr;
    }

    @Override
    public boolean erLevende() {
        return true;
    }
}

interface Arbeidstaker {
    // protected int ansattNr;
    
    public int hentAnsattNr();

    public double hentSkatteprosent();
}

class Student extends Person implements Arbeidstaker {
    /*
    protected String personNr;

    public String hentPersonNr() {
        return personNr;
    }*/

    protected int studentNr;
    protected int ansattNr;


    public int hentStudentNr() {
        return studentNr;
    }

    public int hentAnsattNr() {
        return ansattNr;
    }

    public double hentSkatteprosent() {
        return 0.1;
    }
}