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


int main() {

    int n, op, x;
    f>>n;
    for(int i = 1;i<=n;i++)
    {
        f>>op;
        if(op == 1)
        {
            f>>x;
            v.push_back(x);
            heap.insert(x);
        }
        if(op == 2)
        {
            f>>x;
            heap.erase(v[x-1]);
        }
        if(op == 3)
        {
            auto it = heap.begin();
            g<<*it<<"\n";
        }
    }
    return 0;
}