#include <iostream>
#include <fstream>
#include <vector>
#include <set>
using namespace std;

int main() {
    ifstream fin("heapuri.in");
    ofstream fout("heapuri.out");
    int n, a, x;
    vector<int> v;
    set<int> s;
    fin >> n;
    for (int i = 0; i < n; i++) {
        fin >> a;
        if (a == 1) {
            fin >> x;
            v.push_back(x);
            s.insert(x);
        }
        else if (a == 2) {
            fin >> x;
            int index = x - 1;
            if (index >= 0 && index < v.size()) {
                int value = v[index];
                auto it = s.find(value);
                if (it != s.end()) {
                    s.erase(it);
                }
            }
        }
        else if (a == 3) {
            if (!s.empty()) {
                fout << *s.begin() << endl;
            }
        }
    }
    fin.close();
    fout.close();
    return 0;
}