#include <fstream>
#include <set>
#include <utility>
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");
int n, a[200010], i, x, y, k;

set< pair<int, int> > s;
set< pair<int, int> >::iterator it;

int main(){
    f>>n;
    for(i=1; i<=n; i++)
    {
        f>>x;
        if(x==3)
        {
            it=s.begin();
            g<<it->first<<"\n";
        }
        else if(x==2)
        {
            f>>y;
            s.erase( make_pair(a[y], y) );
        }
        else
        {
            f>>a[++k];
            s.insert( make_pair(a[k], k) );
        }
    }
    return 0;
}