#include <fstream>
#include <iostream>
#include <vector>
#include <set>
using namespace std;
ifstream in("heapuri.in");
ofstream out("heapuri.out");
int n;
int main()
{
    vector <int> v;
    set<int> my_heap;
    in>>n;
    while(n!=0)
    {
         int x, y;
        in >> x;

        if (x == 1)
        {
            in >> y;
            v.push_back(y);
            my_heap.insert(y);
        }
        else if (x == 2)
        {
            in >> y;
            // for (int i = 0; i < v.size(); i++)
            //     if (v[i] == y)
            //     {
            //         v.erase(v.begin() + i );
            //         break;
            //     }
                // cout<<v[i]<<" ";
            my_heap.erase(v[y-1]);
        }
        else
           { 
            // for (int i = 0; i < v.size(); i++)
            //     if (v[i] == y)
            //     {
            //         v.erase(v.begin() + i );
            //         break;
            //     }
                out << *my_heap.begin() << endl;

           }
        
        n--;
    }
    
}