#include <iostream>
#include <fstream>
#include <set>
#define Nmax 200005

using namespace std;

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

int n, op, x, i;
int in[Nmax];
set <int> s;

int main()
{
    f >> n;
    while(n--)
    {
        f >> op;
        if(op == 1)
        {
            f >> x;
            in[++i] = x;
            s.insert(x);
        }
        else if(op == 2)
        {
            f >> x;
            s.erase(in[x]);
        }
        else
        {
            g << *s.begin() << '\n';
        }
    }
    return 0;
}