#include <iostream>
#include <fstream>
#include <set>
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");
set <int> sett;
int x, N, index, operatie, v[200001],pozitie= 0;
int main()
{

    f>>N;
    for(index=1; index<=N; index++)
    {
        f>>operatie;
        if(operatie == 1)
        {
            f>>x;
            sett.insert(x);
            v[++pozitie] = x;
        }
       else
            if(operatie == 2)
        {
            f>>x;
            sett.erase(v[x]);
        }
        else
            g<<*sett.begin()<<endl;

    }
    f.close();
    g.close();
    return 0;
}