import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

class Counter {
    private int value = 0;
    private final ReadWriteLock lock = new ReentrantReadWriteLock();

    public void increment() {
        lock.writeLock().lock(); // Acquire write lock
        try {
            value++;
            System.out.println(Thread.currentThread().getName() 
                + " increments value to: " + value);
        } finally {
            lock.writeLock().unlock(); // Release write lock
        }
    }

    public int getValue() {
        lock.readLock().lock(); // Acquire read lock
        try {
            return value;
        } finally {
            lock.readLock().unlock(); // Release read lock
        }
    }
}

public class Main {
    public static void main(String[] args) {
        final Counter counter = new Counter();

        Runnable reader = () -> {
            for (int i = 0; i < 5; i++) {
                int value = counter.getValue();
                System.out.println(Thread.currentThread().getName() 
                    + " reads value: " + value);
                try {
                    Thread.sleep(1000); // Simulate delay
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        };

        Runnable writer = () -> {
            for (int i = 0; i < 5; i++) {
                counter.increment();
                try {
                    Thread.sleep(1000); // Simulate delay
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        };

        // Create and start multiple reader threads
        Thread[] readers = new Thread[3];
        for (int i = 0; i < 3; i++) {
            readers[i] = new Thread(reader, "Reader-" + (i + 1));
            readers[i].start();
        }

        // Create and start a single writer thread
        Thread writerThread = new Thread(writer, "Writer");
        writerThread.start();

        // Wait for all threads to finish
        try {
            writerThread.join();
            for (Thread readerThread : readers) {
                readerThread.join();
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println("Final value: " + counter.getValue());
    }
}