I am traveling from US-Canada-Japan-Shanghai-Canada-US.

Wondering if this schedule will allow for 144 transit free visit. I am traveling on US passport and have a separate round trip itinerary/ticket for the US to CND portion, a separate one way ticket/Itinerary for the Japan to SHA, and a round trip ticket that shows CND to JAP and SHA to CND. Can you advise if that will allow for the 144 hour visa free visit. I am only staying in SHA 4 days.