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

#define NMAX 200001

set<int> my_set;
int aux_set[NMAX];
int poz = 0;

int N;

int main()
{
	freopen("heapuri.in", "r", stdin);
	freopen("heapuri.out", "w", stdout);

	cin >> N;

	for(int i = 0; i < N; ++i)
	{
		int op;
		cin >> op;
		if(op == 1)
		{
			int x;
			cin >> x;
			my_set.insert(x);
			aux_set[++poz] = x;
		}
		else if(op == 2)
		{
			int x;
			cin >> x;
			my_set.erase(aux_set[x]);
		}
		else
		{
			set <int>::iterator it = my_set.begin();
			cout << *it << endl;
		}
	}

	return 0;
}