#include<bits/stdc++.h>
#include <fstream>
#include <set>
#define Nmax 200001
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");
int n,v[Nmax],nr;
set <int> heap;
int main()
{
    int a,b;
    f>>n;
    for (int i=1;i<=n;i++)
    {
        f>>a;
        if (a==1)
            f>>b,v[++nr]=b,heap.insert(b);
        if (a==2)
            f>>b,heap.erase(v[b]);
        if (a==3)
            g<<*heap.begin()<<'\n';
    }
    return 0;
}