#include <bits/stdc++.h>
#define nmax 200005

using namespace std;

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

set<int>heap;
int poz[nmax], k;

int main()
{
    int op, q, x;
    fin >> q;
    for(; q; q--)
    {
        fin >> op;
        if (op == 1)
        {
            fin >> x;
            poz[++k] = x;
            heap.insert(x);
        }
        else if(op == 2)
        {
            fin >> x;
            heap.erase(poz[x]);
        }
        else fout << *heap.begin() << "\n";
    }

    return 0;
}