#include <iostream>
#include <fstream>
#include <set>

using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");

set<int>Heap;
int n,cod,x,nr;

int main()
{
    f>>n;
    int v[n];

    while(n!=0){

        f>>cod;
        if(cod==1){
            f>>x;
            nr++;
            v[nr]=x;
            Heap.insert(x);
        }
        if(cod==2){
            f>>x;
            Heap.erase(v[x]);
        }
        if(cod==3){
            g<<*Heap.begin()<<"\n";
        }

        n--;
    }

    return 0;
}