You can advance this ice.

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

[subroutine] Do 1 net damage. If there are 3 or more hosted advancement counters, instead do 3 net damage.

[subroutine] Give the Runner 1 tag. If there are 3 or more hosted advancement counters, instead give the Runner 1 tag and end the run.