#include <fstream>
#include <set>
#include <vector>
using namespace std;
ifstream in("heapuri.in");
ofstream out("heapuri.out");
long long n, b, a;
set<int> s;
vector<int> v;
int main(){

    in>>n;
    for(int i=0;i<n;++i){
        in>>a;
        if(a==1){
            in>>b;
            s.insert(b);
            v.push_back(b);
        }
        else if(a==2){
            in>>b;
            s.erase(v[b-1]);
        }
        else{
            out<<*s.begin()<<endl;
        }
    }
    return 0;

}