Output when all copies of a prop are destroyed, or a counter

Ok, so I’m really new to Blueprints, and also very tired, but I have to get this done.

I have a first person scene where clicking props will destroy them. The props are a single blueprint copy/pasted.

FirstPersonCharacter Blueprint:

Now I want something to happen when all four props have been destroyed. So I need either a counter of some sort, or something that can recognize when there’s not a single copy of the prop left in the level.

After each destruction use a Get All Actors of Class Node and get its length. If the length is zero then there are no actors of the class you specify left.