#include <fstream>
#include <set>

using namespace std;

ifstream fin("heapuri.in");
ofstream fout("heapuri.out");

int n,ord[200005];
int cod,val,nrEl;
set <int> heap;
set <int> :: iterator it;

int main()
{
    fin>>n;
    for(int i=1; i<=n; ++i)
    {
        fin>>cod;
        if(cod==1)
        {
            fin>>val;
            ord[++nrEl]=val;
            heap.insert(val);
        }
        if(cod==2)
        {
            fin>>val;
            heap.erase(ord[val]);
        }
        if(cod==3)
        {
            it=heap.begin();
            fout<<*it<<"\n";
        }
    }
    return 0;
}