#include <fstream>
#include <set>

using namespace std;

ifstream fin ("heapuri.in");
ofstream fout ("heapuri.out");

unsigned int N;
unsigned int cod;
unsigned int x;

set <unsigned int> a;
unsigned int v[100001];
unsigned int i, k;

int main ()
{
    fin >> N;
    for (i=1; i<=N; i++)
    {
        fin >> cod;
        if (cod == 1)
        {
            fin >> x;
            a.insert(x);
            v[++k] = x;
        }
        else if (cod == 2)
        {
            fin >> x;
            a.erase(v[x]);
        }
        else
            fout << *a.begin() << '\n';
    }
    return 0;
}