Shanghai with HKG trip, JKF-PVG-HKG-PVG-JFK, 72 hour visa-free transit?

Hi quick question, if y fly into Shanghai from New York on a Friday at noon and leave that same afternoon to HKG, and the fly from HKG on Saturday afternoon to Shanghai, can I then use the 72 hour free transit if im leaving Shanghai to NY on Monday afternoon? So basically the trip wil look:
JKF-PVG-HKG-PVG-JFK