#include <fstream>
#include <vector>
#include <set>

using namespace std;
int n, x, y;
vector <int> v;
set <int> heap;

ifstream f("heapuri.in");
ofstream g("heapuri.out");

int main()
{

    f>>n;
    while (n>0)
    {
        f>>x;
        if(x==1)
        {
            f>>y;
            heap.insert(y);
            v.push_back(y);
        }

        else if(x==2)
            {
                f>>y;
                heap.erase(v[y-1]);
            }
        else
        {
               g<<*heap.begin()<<endl;
        }

        n--;
    }

   return 0;
}