tower defense

  [event]
  name=moveto
  first_time_only=no
      [filter]
      side=4
      x=15,15,16,16,16,17
      y=14,15,13,14,15,14
        [filter_condition]
            [variable]
                name=starting_area
                equals=1
            [/variable]
        [/filter_condition]

      [/filter]
      [set_variable]
        name=player1_count
     	add=1
   	[/set_variable]

     {SET_LABEL  5 24 $player1_count}
[/event]
#[set_variable]
#starting_area=1
#[/set_variable]
#starting_area variable represents spawning location of enemies
#there are 3 areas of enemies that all reach central tower, i want to count enemies reached tower from each area, given that enemies share one side.