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

using namespace std;

set <int> heap;

int n, poz[NMAX], k, a, x;

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

int main()
{
    fin >> n;
    for(int i = 1; i <= n; i++)
    {
        fin >> x;
        if(x == 1)
        {
            fin >> a;
            heap.insert(a);
            poz[++k] = a;
        }
        else if(x == 2)
        {
            fin >> a;
            heap.erase(poz[a]);
        }
        else
            fout << *heap.begin() << '\n';
    }
    return 0;
}