#include <bits/stdc++.h>
using namespace std;
string np = "heapuri";
ifstream f(np + ".in");
ofstream g(np + ".out");

// #define f cin
// #define g cout

int n, len, nr;
int Heap[200003], val[200003], poz[200003];

void push(int x)
{
    int aux;
    while (x / 2 and val[Heap[x]] < val[Heap[x / 2]])
    {
        aux = Heap[x];
        Heap[x] = Heap[x / 2];
        Heap[x / 2] = aux;
        poz[Heap[x]] = x;
        poz[Heap[x / 2]] = x / 2;
        x /= 2;
    }
}
void pop(int x)
{
    int aux, y = 0;
    while (x != y)
    {
        y = x;
        if (y * 2 <= len and val[Heap[x]] > val[Heap[y * 2]])
            x = y * 2;
        if (y * 2 + 1 <= len and val[Heap[x]] > val[Heap[y * 2 + 1]])
            x = y * 2 + 1;
        aux = Heap[x];
        Heap[x] = Heap[y];
        Heap[y] = aux;
        poz[Heap[x]] = x;
        poz[Heap[y]] = y;
    }
}
int main()
{
    f >> n;
    for (int i = 1, cod; i <= n; i++)
    {
        f >> cod;
        if (cod == 1)
        {
            int x;
            f >> x;
            val[++nr] = x;
            Heap[++len] = nr;
            poz[nr] = len;
            push(len);
        }
        if (cod == 2)
        {
            int x;
            f >> x;
            val[x] = -1;
            push(poz[x]);
            poz[Heap[1]] = 0;
            Heap[1] = Heap[len--];
            poz[Heap[1]] = 1;
            if (len > 1)
                pop(1);
        }
        if (cod == 3)
            g << val[Heap[1]] << '\n';
    }

    return 0;
}