#include <fstream>
#include <set>
using namespace std;
ifstream in("heapuri.in");
ofstream out("heapuri.out");
long long n, b, a, k;
set<int> s;
int v[200001];
int main(){

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

}