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

class MyTask implements Runnable {
    Lock lock = new ReentrantLock();

    private final int MAX_COUNT = 100000;
    private int sharedCounter = 0;

    @Override
    public void run() {
        System.out.println("Starting! Shared counter: " + sharedCounter);
        for (int i = 0; i < MAX_COUNT; i++) {
            lock.lock();
            try {
                sharedCounter++;
            } finally {
                lock.unlock();
            }
        }
        System.out.println("Finished! Shared counter: " + sharedCounter);
    }
}