#include <iostream>
#include <fstream>
#include <set>
#include <vector>
using namespace std;

int main()
{
    set<int> s;
    ifstream f("heapuri.in");
    ofstream g("heapuri.out");
    vector<int> v;
    v.push_back(0);
    int n,x,y;
    f>>n;
    while(n)
    {
        n--;
        f>>x;
        if(x==1)
        {
            f>>y;
            v.push_back(y);
            s.insert(y);
        }
        else if(x==2)
        {
            f>>y;
            s.erase(v[y]);
        }
        else
        {
            set<int> :: iterator it=s.begin();
            g<<*it<<'\n';
        }
    }
    return 0;
}