Yeah, sorry.
Sometimes it's easy to forget that some people have just started using Construct, and may not be familiar with it yet.
If all your enemies are the same type (multiple copies of the same enemy), then do what Alspal has written.
If you have more than one type of monster, add each type to the same family (say "Blue") in the editor (see wiki if you're not sure how to do this) and then instead of using enemy.count in the condition, use Blue.count.
Krush.