hello there

I want make a vendor that sell items, so far i did it well, the problem is i dont know a way to add a number of the item inself . for exemple i want 20 Alterac Manna Biscuit in the some slot but i only can get just one... i used this DataBase query: --
HTML Code:
Add Vendor
DELETE FROM `creature_template` WHERE `entry`=56000;
INSERT INTO `creature_template` (`entry`, `difficulty_entry_1`, `difficulty_entry_2`, `difficulty_entry_3`, `KillCredit1`, `KillCredit2`, `modelid1`, `modelid2`, `modelid3`, `modelid4`, `name`, `subname`, `gossip_menu_id`, `minlevel`, `maxlevel`, `exp`, `faction_A`, `faction_H`, `npcflag`, `speed_walk`, `speed_run`, `scale`, `rank`, `mindmg`, `maxdmg`, `dmgschool`, `attackpower`, `dmg_multiplier`, `baseattacktime`, `rangeattacktime`, `unit_class`, `unit_flags`, `dynamicflags`, `family`, `trainer_type`, `trainer_spell`, `trainer_class`, `trainer_race`, `minrangedmg`, `maxrangedmg`, `rangedattackpower`, `type`, `type_flags`, `lootid`, `pickpocketloot`, `skinloot`, `resistance1`, `resistance2`, `resistance3`, `resistance4`, `resistance5`, `resistance6`, `spell1`, `spell2`, `spell3`, `spell4`, `spell5`, `spell6`, `spell7`, `spell8`, `PetSpellDataId`, `VehicleId`, `mingold`, `maxgold`, `AIName`, `MovementType`, `InhabitType`, `Health_mod`, `Mana_mod`, `Armor_mod`, `RacialLeader`, `questItem1`, `questItem2`, `questItem3`, `questItem4`, `questItem5`, `questItem6`, `movementId`, `RegenHealth`, `equipment_id`, `mechanic_immune_mask`, `flags_extra`, `ScriptName`, `WDBVerified`) VALUES (56000, 0, 0, 0, 0, 0, 29855, 0, 0, 0, 'Noob Saibot', 'Tier 10 Vendor', 0, 80, 80, 2, 35, 35, 128, 1, 1.14286, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, '0', 0, 3, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0);
-- Add items to vendor
DELETE FROM `npc_vendor` WHERE `entry`=56000;
INSERT INTO `npc_vendor` (`entry`, `slot`, `item`, `maxcount`, `incrtime`, `ExtendedCost`) VALUES 
(56000,0,19301,0,0,0);
can anyone help me to add 20 instead of just one Alterac Manna Biscuit..
Sry my bad english