#include<iostream>
#include<fstream>
#include<set>
using namespace std;
ifstream in("heapuri.in");
ofstream out("heapuri.out");
multiset <int>  hp;
multiset <int> :: iterator it;
 int main ()
 {    int v[10000],nro,op,p=0;
      in>>nro ;

      for(int i=1; i<=nro; ++i)
       {
           in>>op;
           if(op!=3)
             in>>v[++p];
           else
            {  it=hp.begin();
              out<<*it<<endl;
            }
             if(op==1)
                hp.insert(v[p]);
                else
             if(op==2)
               {
                   hp.erase(v[v[p]]);
               }


        }

        in.close();
        out.close();
        return 0;
 }