#include <fstream>
#include <set>
using namespace std;
ifstream fin ("heapuri.in");
ofstream fout ("heapuri.out");
set<int> h;
int place[200001];
int n,i,x,y,k=0;
int main()
{
    fin>>n;
    for (i=1;i<=n;i++)
    {
        fin>>x;
        if (x==1)
        {
            fin>>y;
            h.insert(y);
            place[++k]=y;
        }
        else if (x==2)
        {
            fin>>y;
            h.erase(place[y]);
        }
        else
        {
            fout<<*h.begin()<<'\n';
        }
    }
    return 0;
}