class PC
{
  public static void main()
  {
    Q q = new Q();
    new Producer(q);
    new Consumer(q);
    try { Thread.sleep(5000); } catch(InterruptedException e) {} ;
    q.work = false;
  }
}
class Q
{
  int n;
  boolean valueSet = false;
  boolean work = true;
  synchronized int get()
  {
    if (!valueSet) try { wait(); }
    catch(InterruptedException e) {} ;
    int sum=0;
    sum +=n;
    System.out.println("Got: " + sum);
    valueSet = false;
    notify();
    return n;
  }
  synchronized void put(int n)
  {
    if (valueSet) try { wait(); }
    catch(InterruptedException e) {} ;
    this.n = n;
    System.out.println("Put: " + n);
    valueSet = true;
    notify();
  }
}
class Producer implements Runnable
{
  Q q;
  Producer(Q q)
  {
    this.q = q; new Thread(this, "Producer").start();
  }
  public void run()
  {
    int i = 1;  while (q.work) { q.put(i++); }
  }
}
class Consumer implements Runnable
{
  Q q;
  Consumer(Q q)
  {
    this.q = q;
    new Thread(this, "Consumer").start();
  }
  public void run()
  {
    while (q.work) { q.get(); }
  }
}