#include <fstream>
#include <vector>
#include <set>
using namespace std;
ifstream fin("heapuri.in");
ofstream fout("heapuri.out");
set<int> heap;
vector<int> v;
int n, cer, x, ind;
int main()
{
    v.push_back(0);
    fin >> n;
    for (int i = 1; i <= n; ++i)
    {
        fin >> cer;
        if (cer == 1)
        {
            fin >> x;
            v.push_back(x);
            heap.insert(x);
        }
        else if (cer == 2)
        {
            fin >> x;
            heap.erase(v[x]);
        }
        else
            fout << *heap.begin() << '\n';
    }
    fin.close();
    fout.close();
    return 0;
}