import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.Condition;

class MyTask1 implements Runnable {
    Beholder tallBeholder;

    public MyTask1(Beholder tb) {
        tallBeholder = tb;
    }

    public void run() {
        for (int i = 0; i < 5000; i++) {
            tallBeholder.tellOpp();
        }
        System.out.println(tallBeholder.getTall());

    }

}

class MyTask2 implements Runnable {
    Beholder tallBeholder;

    public MyTask2(Beholder tb) {
        tallBeholder = tb;
    }

    public void run() {
        for (int i = 0; i < 5000; i++) {
            tallBeholder.tellNed();
        }
        System.out.println(tallBeholder.getTall());

    }

}

class Beholder {
    private int tall = 0;
    private Lock laas = new ReentrantLock();
    private Condition trengerEnTilAaTelleOpp = laas.newCondition();

    public void tellOpp() {
        laas.lock();
        tall++;
        trengerEnTilAaTelleOpp.signal();
        laas.unlock();
    }

    public void tellNed() {
        laas.lock();
        try {
            while (tall == 0) trengerEnTilAaTelleOpp.await();
            tall--;
        } catch (InterruptedException exception) {
            System.out.println("Halla");
        } finally {
            laas.unlock();
        }

    }

    public int getTall() {
        return tall;
    }
}