#include <bits/stdc++.h>
using namespace std;

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

int n;
set<int> s;

int main() {
    fin >> n;
    vector<int> arr;
    for (int i = 0; i < n; ++i) {
        int c, x;
        fin >> c;
        if (c == 1) {
            fin >> x;
            s.insert(x);
            arr.push_back(x);
        } else if (c == 2) {
            fin >> x;
            s.erase(arr[x - 1]);
        } else {
            fout << *s.begin() << "\n";
        }
    }
    return 0;
}