#include <fstream>
#include <set>
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");

int N, x, a[200005], tip, nr;
set < int > H;

int main()
{
    f>>N;
    for (int i=1; i<=N; ++i)
    {
        f>>tip;
        if (tip==1) f>>x, a[++nr]=x, H.insert(x);
            else if (tip==2) f>>x, H.erase(a[x]);
                else g<<*H.begin()<<'\n';
    }
    return 0;
}