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

int main()
{
    ifstream f("heapuri.in");
    ofstream g("heapuri.out");
    vector <int> v;
    set <int> h;
    int n,caz,x;
    f>>n;
    for (int i=0; i<n; i++)
    {
        f>>caz;
        if(caz==1)
        {
            f>>x;
            h.insert(x);
            v.push_back(x);
        }
        if(caz==2)
        {
            f>>x;
            int elem=v[x-1];
            h.erase(elem);
        }
        if(caz==3)
        {
            g<<*h.begin()<<endl;
        }
    }
    return 0;
}