#include <fstream>
#include <set>

#define NMAX 200005

using namespace std;

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

int n, k;
int poz[NMAX];
set<int> heap;

int main() {
    int i, a, x, cod;

    fin >> n;
    for (i = 1; i <= n; i++) {
        fin >> cod;
        if (cod == 1) {
            fin >> a;
            heap.insert(a);
            poz[++k] = a;
        } else if (cod == 2) {
            fin >> a;
            heap.erase(poz[a]);
        } else
            fout << *heap.begin() << '\n';
    }

    fin.close();
    fout.close();

    return 0;
}