Number of entries that we should apply for

Hi,

Our travel itinerary is as follows:

Kathmandu to Hong Kong (1st Entry)
Hong Kong to Seoul and back to Hong Kong (2nd Entry)
Hong Kong to Beijing and back to Hong Kong (3rd Entry)
Hong Kong to Kathmandu

This seems that we have to apply for 3 entries visa. Is it there while applying. On each entry we just need 3 days on Hong Kong.

Thank you so much.

Deepak.