#include <fstream>
#include <vector>
#include <set>

using namespace std;

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

int N;
set <int> heap;
vector <int> ins;

int main()
{
    fin >> N;

    int type, x;
    for(int i = 1; i <= N; i++)
    {
        fin >> type;

        if(type == 1)
        {
            fin >> x;
            ins.push_back(x);
            heap.insert(x);
        }
        else if(type == 2)
        {
            fin >> x;
            heap.erase(ins[x - 1]);
        }
        else
            fout << *heap.begin() << '\n';
    }

    return 0;
}