import java.io.*;

import java.util.*;



public class Median {



  public static class MedianPriorityQueue {

    PriorityQueue<Integer> left;

    PriorityQueue<Integer> right;



    public MedianPriorityQueue() {

      left = new PriorityQueue<>(Collections.reverseOrder());

      right = new PriorityQueue<>();

    }



    public void add(int val) {

      // write your code here

      

      if(right.size() >0 && val > right.peek()){

          right.add(val);

      }

      else{

          left.add(val);

      }

      

      if(left.size() - right.size()==2){

          right.add(left.remove());

      }

      else if(right.size() - left.size()==2){

          left.add(riht.remove());

      }

    }



    public int remove() {

      // write your code here

      if(this.size() == 0){

          return -1;

      }

      else if(left.size() >= right.size()){

          return left.remove();

      }

      else{

          return right.remove();

      }

    }



    public int peek() {

      // write your code here

      

      if(this.size() == 0){

          return -1;

      }

      else if(left.size() >= right.size()){

          return left.peek();

      }

      else{

          return right.peek();

      }

      

    }



    public int size() {

      // write your code here

      return left.size()+right.size();

    }

  }



  public static void main(String[] args) throws Exception {

    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

    MedianPriorityQueue qu = new MedianPriorityQueue();



    String str = br.readLine();

    while (str.equals("quit") == false) {

      if (str.startsWith("add")) {

        int val = Integer.parseInt(str.split(" ")[1]);

        qu.add(val);

      } else if (str.startsWith("remove")) {

        int val = qu.remove();

        if (val != -1) {

          System.out.println(val);

        }

      } else if (str.startsWith("peek")) {

        int val = qu.peek();

        if (val != -1) {

          System.out.println(val);

        }

      } else if (str.startsWith("size")) {

        System.out.println(qu.size());

      }

      str = br.readLine();

    }

  }

}