Can I request how to limit monster in a script

[Famous]

//===== eAthena Script =======================================
//= Treasure Room
//===== By: ==================================================
//= Chasis of ThugRO
//===== Current Version: =====================================
//= v.1
//===== Compatible With: =====================================
//= Any eAthena Version
//===== Description: =========================================
//= Its a Pirate Thing way of Mining.
//= for any revision or bug just let me know
//============================================================
//========== Treasure Room Settings ==========================
bat_b02.gat	mapflag	nosave	SavePoint
bat_b02.gat	mapflag	nomemo
bat_b02.gat	mapflag	nobranch
bat_b02.gat	mapflag	noexp
bat_b02.gat	mapflag	nodrop
bat_b02.gat	mapflag	nochat
bat_b02.gat	mapflag	novending
bat_b02.gat	mapflag	nowarp
bat_b02.gat	mapflag	nowarpto
bat_b02.gat	mapflag	noreturn
//bat_b02.gat	mapflag	pvp
//bat_b02.gat	mapflag	pvp_noguild
bat_b02.gat	mapflag	noloot


//===========================================================
//=== Mobs
//===========================================================
-	script	Arena7	-1,{

OnInit:
// Target Mobs
monster "bat_b02",0,0,"Arena Guardian",1039,5,"Arena7::OnMobKilled";
end;

OnMobKilled:
monster "bat_b02",0,0,"Arena Guardian",1286,5,"Arena7::OnMobKilled";
set $@ran, rand(1,3);
if ($@ran == 1) getitem 7227,1;
if ($@ran == 2) getitem 7385,25;
if ($@ran == 3) getitem 7385,15;
}

[Emistry]

just make it spawn 1 upon killed...not 5...

OnMobKilled:
monster "bat_b02",0,0,"Arena Guardian",1286,1,"Arena7::OnMobKilled";

[Famous]

thanks Emistry...........