import java.util.concurrent.locks.ReentrantLock;

public class Monitor {

    private int fellesTeller = 0;
    ReentrantLock laas = new ReentrantLock();

    void leggTil(){
        laas.lock();
        try {
            fellesTeller++;
        }
        finally {
            laas.unlock();
        }
    }

    public int hentTeller(){
        return fellesTeller;
    }
}