#include <iostream>
#include <vector>
#include <set>
#include <fstream>
using namespace std;
ifstream f("heapuri.in");
ofstream g ("heapuri.out");
vector <long long> poz;
set <long long> v;
long n;
long long nr, k;
int main()
{
    f >> n;
    int op;
    for(long i = 0; i < n; i++)
    {
        f >> op;
        if(op == 1) {
            f >> nr;
            v.insert(nr);
            poz.push_back(nr);
        }
        if(op == 2)
        {
            f >> nr;
            v.erase(poz[nr-1]);
        }
        if(op == 3)
            {
                int first = *v.begin();
                g << first <<'\n';
            }
    }
    return 0;
}