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