500
These are the steps you take when you notice Liz's baby girl not moving from across the room (when you give rescue breaths, they do NOT go in, even after re-tilting)
What is 'check scene for safety, check baby for consciousness, get consent (if applicable), call 911 because she's unconscious, assess breathing 10 sec, give 2 breaths because she's not breathing, re-tilt & try again, [scan for severe bleeding], give 30 chest compressions, check for object in mouth, 2 rescue breaths,...'