Starcraft trigger help.

In Starcraft Map Editor, how do I make a trigger that has conditions that essentially add up to:

"Player" controls "#" "unit" at "Location"

Or

"#" deaths of "unit" at "Location"

I've already tried "Player" brings "at most #" "unit" to "Location", and it doesn't work- the trigger activates whether or not the number of units at "Location" actually is "at most #".

Help me out, please?

Is there an:

'at least' trigger?

Bring 'at least' x# of units to location