#include <bits/stdc++.h>
using namespace std;

const int MAXN = 200010;

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

int m, tip, x, ord[MAXN], cnt;
set <int> heap;

int main()
{
    fin >> m;
    for (; m; --m)
    {
        fin >> tip;
        if (tip == 3) fout << *heap.begin() << '\n';
        else
        {
            fin >> x;
            if (tip == 1)
            {
                heap.insert(x);
                ord[++cnt] = x;
            }
            else
            {
                heap.erase(ord[x]);
            }
        }
    }
    return 0;
}