#include <fstream>
#include <set>
#define Nmax 200011
using namespace std;
ifstream fin("heapuri.in");
ofstream fout("heapuri.out");
int n,v[Nmax],nr;
set <int> heap;
set <int>::iterator it;
int main()
{
    int i,a,b;
    fin>>n;
    for (i=1;i<=n;i++)
    {
        fin>>a;
        if (a==1)
            fin>>b,v[++nr]=b,heap.insert(b);
        if (a==2)
            fin>>b,heap.erase(heap.find(v[b]));
        if (a==3)
            it=heap.begin(),fout<<*it<<"\n";
    }
    return 0;
}