#include <iostream>
#include <fstream>
#include <set>
using namespace std;
int main(){
    ifstream f("heapuri.in");
    ofstream g("heapuri.out");
    int n, a, b, v[100 000 001], j= 0;

    set <int> multime;
    f>>n;

    for (int i = 1; i<=n;i++){
        f>>a;
        if( a== 1){
            f>>b;
            multime.insert(b);
            j++;
            v[j]= b;
            
        }
        else if( a== 2){
            f>> b;
            
            multime.erase(v[b]);

        }
        else{
            g<< *multime.begin() <<endl;
        }
    }
    f.close();
    g.close();

}