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

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

std :: set <int> myset;
std :: set <int> :: iterator it;

int i,n,x,y,a[200001],nr;

int main ()
{
   f>>n;
   for (i=1;i<=n;i++)
   {
     f>>x;
     if (x==1)
     {
         f>>a[++nr];
         myset.insert(a[nr]);
     }
     else
     if (x==2)
     {
         f>>y;
         myset.erase(myset.find(a[y]));
     }
     else it=myset.begin(),g<<*it<<'\n';
   }

return 0;
}