#include <iostream>
#include <fstream>
#include <set>
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");
int v[200001],l,n;
int main() {

    f>>n;
    set<int> heap;
    int c,x;
    for(int i=1;i<=n;i++)
    {
        f>>c;
        if(c==1)
        {

            f>>x;
            v[l++]=x;
            heap.insert(x);

        }
        if(c==2)
        {
            f>>x;
            heap.erase(v[x-1]);
        }
        if(c==3)
        {
            g<<*heap.begin()<<endl;
        }
    }
}