#include <iostream>
#include<set>
#include<vector>
#include<fstream>

using namespace std;

ifstream f("heapuri.in");
ofstream g("heapuri.out");
set<int> m;
vector<int>v;

int main()
{
    int n;
    f >> n;
    for(int i = 0; i < n; i++)
    
    {
        int op;
        f >> op;
        
        if(op == 1)
        {
            int x;
            f >> x;
            m.insert(x);
            v.push_back(x);
        }
        
        else if(op == 2)
        {
            int x;
            f >> x;
            int el = v[x - 1];
            m.erase(el);
        }
        
        else if(op == 3)
        {
            g << *m.begin() << "\n";
        }
    }
    return 0;
}