#include <fstream>
#include <vector>
#include <set>
#include <functional>

int main()
{
    std::ifstream fin("heapuri.in");
    std::ofstream fout("heapuri.out");
    int n;
    std::set<int> s;
    std::vector<int> history;

    fin >> n;
    for(int i = 0; i < n; i++)
    {
        int c;
        fin >> c;

        if(c == 1)
        {
            int x;
            fin >> x;

            s.insert(x);
            history.push_back(x);
        }
        else if (c == 2)
        {
            int x;
            fin >> x;

            s.erase(history[x - 1]);
        }
        else if (c == 3)
        {
            fout << *s.begin() << std::endl;
        }
    }

    return 0;
}