#include <iostream>
#include <fstream>
#include <set>
using namespace std;
set<int> h;
int main()
{   ifstream f("heapuri.in");
    ofstream g("heapuri.out");
    int n,x,v[20001],poz=1,y;
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        f>>x;
        //identificam tipul operatiei
        if(x==1)
        {   //executam inserarea
            f>>y;
            h.insert(y);
            v[poz]=y;
            poz++;

        }
        else
        if(x==2)
        {  //executam stergerea
            f>>y;
            h.erase(v[y]);

        }
        else
        if(x==3)
        {   //afisam cel mai mic numar
            g<<*h.begin()<<"\n";
        }
    }



    return 0;
}