#include <fstream>
#include <set>

using namespace std;

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

const int DIM = 200010;
int n, op, x, cnt;
int pos[DIM];
set<int> s;

int main() {
    fin >> n;
    for (int i = 1; i <= n; i++) {
        fin >> op;

        if (op == 1) {
            fin >> x;
            s.insert(x);
            pos[++cnt] = x;
        } else if (op == 2) {
            fin >> x;
            s.erase(pos[x]);
        } else {
            fout << *(s.begin()) << '\n';
        }
    }

    return 0;
}