import java.util.concurrent.locks.*;

class Monitor {

    int kaffe = 0;
    int kaker = 0;
    final int maksKaffe = 4;
    final int maksKaker = 4;
    private final Lock l?s = new ReentrantLock();
    private final Condition ordreKlar = l?s.newCondition();
    private final Condition kaffeIkkeFull = l?s.newCondition();
    private final Condition kakerIkkeFull = l?s.newCondition();

    public void leggTilKaffe() throws InterruptedException {
        l?s.lock();
        try {
            while (kaffe == maksKaffe) {
                kaffeIkkeFull.await();
            }
            kaffe++;
            System.out.println("En kaffe klar");
            if (kaffe > 0 && kaker > 0) {
                ordreKlar.signal();
            }
        } finally {
            l?s.unlock();
        }
    }

    public void leggTilKaker() throws InterruptedException {
        l?s.lock();
        try {
            while (kaker == maksKaker) {
                kakerIkkeFull.await();
            }
            kaker++;
            System.out.println("En kake klar");
            if (kaffe > 0 && kaker > 0) {
                ordreKlar.signal();
            }
        } finally {
            l?s.unlock();
        }
    }

    public void hentOrdre() throws InterruptedException {
        l?s.lock();
        try {
            while (kaker == 0 || kaffe == 0) {
                ordreKlar.await();
            }
            kaffe--;
            kaker--;
            System.out.println("En ordre er hentet");
            kakerIkkeFull.signal();
            kaffeIkkeFull.signal();
        } finally {
            l?s.unlock();
        }
    }
}