#include <fstream>
#include <set>
using namespace std;
set <int> s;
int n,i,op,x,v[200005],c;
int main()
{
    ifstream fin("heapuri.in");
    ofstream fout("heapuri.out");
    fin>>n;
    for(i=1;i<=n;i++)
    {
        fin>>op;
        if(op==1)
        {
            fin>>x;
            s.insert(x);
            v[++c]=x;
        }
        else if(op==2)
        {
            fin>>x;
            s.erase(v[x]);
        }
        else
        {

            fout<<*s.begin()<<"\n";
        }
    }
    return 0;
}