How to play volleyball when the fifth team enters the third team?

The volleyball match in which the fifth team enters the third team can adopt round robin or elimination system.

In the round robin, five teams will compete with each other. The winner gets 2 points, and the loser gets 1 point. Finally, the top three teams will advance.

In the knockout stage, the five teams will draw lots and compete in the form of a single defeat knockout, and finally the top three teams will advance.