1 Vs 4 GameMode survival

Okay so I am trying to make a multiplayer game mode that has one person playing as a hunter and four other people playing as survivors what i am trying to accomplish here is having the four survivors activating some switches to enable an escape i have already made that work in blueprint but the next step where im having problems is having the game know when all 4 survivors have went through the escape for a survivor victory and the game also needs to know when all 4 survivors are dead for the hunter victory