#include <fstream>
#include <set>
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");
int v[200001],i,t,n,x,l;
set <int> s;
int main()
{
    f>>n;
    for (i=1;i<=n;i++)
    {
      f>>t;
      if (t<=2)
      {
        f>>x;
        if (t==1)
          s.insert(x),v[++l]=x;
        else
         s.erase(v[x]);
      }
        else g<<*s.begin()<<'\n';
    }
    return 0;
}