Hello I am doing a one shot which is Peril in Pinebrook however the game is set for 4 players but in the oneshot it says at one point:

If you have more than four players, they can change the names and descriptions on a duplicate character sheet so that they’ll have unique characters with similar abilities and equipment

My question is that I am going to be the dm of this oneshot never did before and if I am to do have 5 players even though it is meant for 4 players do I need to adjust the hit points of the enemies and dc of any other event etc?

is there perhaps a formula that is available to adjust automatically hitpoints and dc on oneshots to the number of extra players that will be added if in the future)