function onUse(player, item, fromPosition, target, toPosition, isHotkey)
local targetItemId = 2494 --Demon Armor ID
local totalItemCount = player:getItemCount(targetItemId)
local equipedItemCount = 0
for slot = CONST_SLOT_HEAD, CONST_SLOT_AMMO do
local itemInSlot = player:getSlotItem(slot)
if itemInSlot and itemInSlot:getId() == targetItemId then
equipedItemCount = equipedItemCount + 1
end
end
local desiredCount = totalItemCount - equipedItemCount
print("Player have: "..totalItemCount.." in total.")
print("Player have: "..equipedItemCount.." equiped.")
print("Player have: "..desiredCount.." in backpack.")
return true
end