You can advance this ice. If there are 3 or more hosted advancement counters, the Runner cannot break subroutines on this ice using AI programs.

[subroutine] Gain 1[credit]. If there are 3 or more hosted advancement counters, instead gain 4[credit].

[subroutine] End the run. If there are 3 or more hosted advancement counters, instead search R&D for up to 2 cards. Add those cards to HQ, then end the run.