import java.util.concurrent.Semaphore;

class IntCell {
    private int n = 0;
    public int getN() {return n;}
    public void setN(int n) {this.n = n;}
}

class Count extends Thread {
    static IntCell n = new IntCell();
    static Semaphore s = new Semaphore(1);
    @Override public void run() {
      int temp;
      for (int i = 0; i < 200000; i++) {
        try {
            s.acquire();
        } catch (InterruptedException e) {
            e.printStackTrace();}
        temp = n.getN();
        n.setN(temp + 1);

        s.release();
      }
    }

    public static void main(String[] args) {
      Count p = new Count();
      Count q = new Count();
      p.start();
      q.start();
      try { p.join(); q.join(); }
      catch (InterruptedException e) { }
      System.out.println("The value of n is " + n.getN());
    }
}

class IntCell {
    private int n = 0;
    private boolean done=true;

    public synchronized int getN()
    {
        try {
            while(!done)
                wait();

        }catch(InterruptedException e) {}
        done=false;
        notifyAll();
        return n;
    }
    public synchronized void setN(int n) {
        try {
            while(done)
                wait();
        }catch(InterruptedException e) {}
        done=true;
        notifyAll();
        this.n = n;
    }
}

class Count extends Thread {
    static IntCell n = new IntCell();
    @Override public void run() {
      int temp;
      for (int i = 0; i < 200000; i++) {
        temp = n.getN();
        n.setN(temp + 1);
      }
    }

    public static void main(String[] args) {
      Count p = new Count();
      Count q = new Count();
      Count w = new Count();
      p.start();
      q.start();
      w.start();
      try { p.join(); q.join(); w.join(); }
      catch (InterruptedException e) { }
      System.out.println("The value of n is " + n.getN());
    }
}