import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

class Hovedprogram {
  public static void main(String[] args) {
    int varISalen = 15;
    int nyePublikum = 20;
    int skuespillere = 2;

    Teater t = new Teater(varISalen);

    CyclicBarrier venterPaaPublikum = new CyclicBarrier(nyePublikum + skuespillere);
    CountDownLatch alleGaattUt = new CountDownLatch(varISalen);

    Skuespiller s1 = new Skuespiller(venterPaaPublikum, "\n Romeo!");
    new Thread(s1).start();
    Skuespiller s2 = new Skuespiller(venterPaaPublikum, "\n Oh Juliet!");
    new Thread(s2).start();

    for (int i = 0; i < varISalen; i++){
      Runnable r = new Runnable() {
        public void run(){
          t.gaaUt();
          alleGaattUt.countDown();
        }
      };
      Thread thread = new Thread(r);
      thread.start();
      //new Thread(r).start();
    }
    try{
      alleGaattUt.await();
    }catch(Exception e){}
    for (int i = 0; i < nyePublikum; i++) {
      InniSalen publikum = new InniSalen(venterPaaPublikum, t);
      Thread thread = new Thread(publikum);
      thread.start();
    }

  }
}

class Skuespiller implements Runnable {
  CyclicBarrier barriere;
  String tekst;

  public Skuespiller(CyclicBarrier barriere, String tekst){
    this.barriere = barriere;
    this.tekst = tekst;
  }
  public void run(){
    try {
      barriere.await();
      System.out.println(tekst);
    } catch (Exception e) {}

  }
}

class InniSalen implements Runnable {
  public CyclicBarrier barriere;
  Teater t;

  public InniSalen(CyclicBarrier barriere, Teater t){
    this.barriere = barriere;
    this.t = t;
  }

  public void run(){
    try {
      t.gaaInn();
      barriere.await();
    } catch(Exception e) {

    }
  }
}

class Teater {
  private int antPersoner;
  private Lock lock = new ReentrantLock();

  public Teater(int antPersoner){
    this.antPersoner = antPersoner;
  }

  public void gaaInn(){
    lock.lock();
    try{
      antPersoner ++;
      System.out.println("Gikk inn, naa: " + antPersoner);
    }
    finally{
      lock.unlock();
    }


  }

  public void gaaUt(){
    lock.lock();
    try{
      antPersoner --;
      System.out.println("Gikk ut, naa: " + antPersoner);
    }
    finally{
      lock.unlock();
    }
  }
}