Hong Kong - Macau - Shanghai - Taiwan

Hello,
Is it possible while starting in Hong Kong if I do a day trip in Macau then return to Hong Kong, then go to Shanghai and then Taiwan as my third country? In other words, use Hong Kong AND Macau as my 'A' region, Shanghai as my 'B' region for the specified period (in this case only 2 days) then head on wards to Taiwan 'C' region.

Thank You