#include <iostream>
#include <fstream>
#include <set>
#include <vector>
using namespace std;

ifstream fin("heapuri.in");
ofstream fout("heapuri.out");

set<unsigned int> pseudoHeap;
vector<unsigned int> poz;
unsigned int n, op, x;

int main()
{
    fin >> n;

    for (int i = 0; i < n; i++)
    {
        fin >> op;
            
        if (op == 1)
        {
            fin >> x;
            poz.push_back(x);
            pseudoHeap.insert(x);
        }
        else
            if (op == 2)
            {
                fin >> x;
                pseudoHeap.erase(poz[x - 1]);
            }
        else
                fout << *pseudoHeap.begin() << '\n';
    }
}