#include <iostream>
#include <fstream>
#include <algorithm>
#include <set>
using namespace std;
ifstream fi("heapuri.in");
ofstream fo("heapuri.out");
set<int>h;
int v[200005],n,x,y;
int main() {
    fi>>n;
    int k=0;
    for (int i=1;i<=n;i++) {
        fi>>x;
        if (x==1) {
            fi>>y;
            h.insert(y);
            v[k++]=y;
            continue;}
        else
            if (x==2) {
                fi>>y;
                h.erase(v[y]);
                continue;}
            else {
                set<int>::iterator it=h.begin();
                fo<<*it<<'\n';}}
    return 0;}