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

int main () {
    ifstream fin ("heapuri.in");
    ofstream fout ("heapuri.out");
    set <int> H;
    vector <int> v;

    int n, x, key;
    fin >> n;
    v.push_back(0);
    for (; n; n--) {
        fin >> key;
        switch (key) {
        case 1:
            fin >> x;
            H.insert(x);
            v.push_back(x);
            break;
        case 2:
            fin >> x;
            H.erase(H.find(v[x]));
            break;
        default:
            fout << *(H.begin()) << '\n';
            break;
        }
    }
    return 0;
}