#include <iostream>
#include <fstream>
#include <set>
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");
const int NMAX = 200010;
set <int> MySet;
int a[NMAX], dr;
int main()
{
	int c, x, n;
	f >> n;
	for (int i = 1; i <= n; i++)
	{
		f >> c;
		if (c == 1)
		{
			f >> x;
			MySet.insert(x);
			a[++dr] = x;
		}
		else
			if (c == 2)
		{
			f >> x;
			MySet.erase(a[x]);
		}
			else   
			    g << *MySet.begin() << '\n';
	}
}