import java.util.PriorityQueue;
public class MainClass {
public static void main(String[] argv) {
PriorityQueue<String> pq = new PriorityQueue<String>();
pq.add("2");
pq.add("4");
System.out.print(pq.peek() + " ");
pq.offer("1");
pq.add("3");
pq.remove("1");
System.out.print(pq.poll() + " ");
if (pq.remove("2"))
System.out.print(pq.poll() + " ");
System.out.println(pq.poll() + " " + pq.peek());
}
}
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