#include <iostream>
#include <fstream>
#include <set>
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");
set <int> heap;
int main(){
  int n,op,v[200001],k=1,x, nr=1;
    f>>n;
    for(int i=1;i<=n;i++)
    {
        f>>k;
        if(k==1)
        {
            f>>x;
            heap.insert(x);
            v[nr]=x;
            nr++;

        }
        else if(k==2)
        {
            f>>x;
            heap.erase(v[x]);

        }
        else
        {
            g<<*heap.begin()<<"\n";
        }
    }

}