#include <fstream>

using namespace std;

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

int n, elemente, nrElementeHeap;
int heap[200001], pozHeap[200001], vecInitial[200001];

void heapDown(int p) {
    if (p == nrElementeHeap) {
        nrElementeHeap--;
        return;
    }
    heap[p] = heap[nrElementeHeap--];
    pozHeap[heap[p]] = p;
    while (p / 2 > 0 && vecInitial[heap[p]] < vecInitial[heap[p / 2]]) {
        {
            swap(heap[p], heap[p / 2]);
            vecInitial[heap[p]] = p;
            vecInitial[heap[p / 2]] = p / 2;
            p = p / 2;
        }
    }
    while (2 * p <= nrElementeHeap) {
        int st = 2 * p, dr = 2 * p + 1, crt = p;
        if (vecInitial[heap[st]] < vecInitial[heap[crt]])
            crt = st;
        if (dr <= nrElementeHeap && vecInitial[heap[dr]] < vecInitial[heap[crt]])
            crt = dr;
        if (crt != p) {
            swap(heap[p], heap[crt]);
            pozHeap[heap[crt]] = crt;
            pozHeap[heap[p]] = p;
            p = crt;
        }
        else
            break;

    }
}


int heapUp(int pozitie)
{
    int t = pozitie;
    while (t / 2 >= 0 && vecInitial[heap[t / 2]] > vecInitial[heap[t]])
    {
        //fac interschimbarea in heap
        swap(heap[t / 2], heap[t]);
        pozHeap[heap[t / 2]] = t / 2;
        pozHeap[heap[t]] = t;
        t /= 2;
    }
    return t;
}

void eliminHeap(int pozitie)
{
    if (pozitie == nrElementeHeap)
    {
        nrElementeHeap--;
        return;
    }
    heap[pozitie] = heap[nrElementeHeap--];

    heapUp(pozitie);
    heapDown(pozitie);
}

int main()
{
    fin >> n;
    for (int i = 1; i <= n; i++)
    {
        int op, x;
        fin >> op;
        if (op == 1)
        {
            fin >> x;
            vecInitial[++elemente] = x;
            heap[++nrElementeHeap] = elemente;
            pozHeap[elemente] = nrElementeHeap;

            //fac urcare
            heapUp(nrElementeHeap);
        }
        else if (op == 3)
        {
            fout << vecInitial[heap[1]] << "\n";
        }
        else
        {

            fin >> x;
            eliminHeap(pozHeap[x]);
        }
    }

    /*for (int i = 1; i <= nrElementeHeap; i++)
    {
        fout<<heap[i]<<" ";

    }
    fout<<"\n";
    for(int i=1; i<=nrElementeHeap; i++)
    {
        fout<<vecInitial[heap[i]]<<" ";

    }*/

    return 0;
}