How many entries should I apply for?

I will be cruising to China to join a Land Tour. I will be in Hong Kong on 11th March then cruise to Xiamen where we will be on the 13th and then cruise on to Shangai where we will leave the cruise on the 15th. In between the above we will not visit any other countries. Will a single entry Visitor L visa be okay? Or will I need a multiple entry? Thank you.