Get a live count of actor type

I need to get a live count of a certain actor on screen.  For example, if there is one actor of the type, the count is one, but if that actor is killed I need the count to go down to 0.  I can easily get a count of the actor, I just cant decrease the count if it dies.   Even a "if actor exists" type of boolean statement would work because I only expect one actor at a time.

There's a block to check if an actor is alive under Actor > Properties.

That is exactly what I needed, thank you so much.