#include <iostream>
#include <bits/stdc++.h>
using namespace std;
ifstream f("heapuri.in"); ofstream g("heapuri.out");
int n,a[200001],lg,val,tip_ex;
set<int> m;
int main()
{   f>>n;
    for(int i=1; i<=n; ++i){
        f>>tip_ex;
        if(tip_ex == 3) g<<*m.begin()<<endl; /// afisare minim
        else
        {   f>>val;
            if(tip_ex == 1) ///inserare
            {   a[lg++] = val;
                m.insert(val);
            }
            if(tip_ex == 2) m.erase(a[val-1]); ///stergere al x lea element
        }
    }
    f.close();
    g.close();
    return 0;
}