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

public class CountMonitor {
    private final Lock lock = new ReentrantLock();
    private int count_shared = 0;

    public void tell(){
        lock.lock();
        try {
            count_shared++; // Kritiske region
        } finally {
            lock.unlock();
        }
    }

    public int returnVerdi(){
        return count_shared;
    }
}