import java.util.concurrent.locks.*;

class MinBeholderMonitor {

    MinBeholder beholder;
    Lock laas = new ReentrantLock();
    Condition ikkeLengerTom = laas.newCondition();

    public MinBeholderMonitor(MinBeholder beholder){
        this.beholder = beholder;
    }

    public void leggPaa(int tall){

        laas.lock();
        try {
            beholder.leggPaa(tall);
            ikkeLengerTom.signal();

        }
        finally{
            laas.unlock();
        }
    }

    public void trekkFra(int tall){


        laas.lock();
        try {
            if (beholder.hentVerdi() < 1){
                ikkeLengerTom.await();
            }
            beholder.trekkFra(tall);
        }
        catch(Exception e){

        }
        finally{
            laas.unlock();
        }
    }

    public int hentVerdi(){
        return beholder.hentVerdi();
    }



}