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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();
}
}
}
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