# include <set>
# include <vector>

using namespace std;

long n,t,x;
set <int> heap;
vector <int> v;

int main()
{
	freopen("heapuri.in","r",stdin);
	freopen("heapuri.out","w",stdout);
	scanf("%ld", &n);
	for (long i=1;i<=n;++i)
	{
		scanf("%ld", &t);
		if (t==3)
			printf("%ld\n", *heap.begin());
		else
			if (t==1)
			{
				scanf("%ld", &x);
				heap.insert(x);
				v.push_back(x);
			}
			else
			{
				scanf("%ld", &x);
				heap.erase(v[x-1]);
			}
	}
	return 0;
}