function echange()

	nbaraun = inventory:itemCount(6914)
		for i = 1, nbaraun do
			inventory:deleteItem(6914,1)
		end

	nbaradeux = inventory:itemCount(6911)
		for i = 1, nbaradeux do
			inventory:deleteItem(6914,1)
		end

	nbaratrois = inventory:itemCount(6912)
		for i = 1, nbaratrois do
			inventory:deleteItem(6914,1)
		end

	nbaraquatre = inventory:itemCount(6913)
		for i = 1, nbaraquatre do
			inventory:deleteItem(6914,1)
		end

	prixPoudre =  sale:GetpriceItem(519,3)
	prixAra =  sale:GetpriceItem(365,3)
	npc:npcSale()
	nbpoudre = math.ceil(inventory:itemCount(519)/100)
		for i = 1, nbpoudre do
			sale:SellItem(519, 100, prixPoudre -1)
		end

	nbara = math.ceil(inventory:itemCount(365)/100)
		for i = 1, nbara do
			sale:SellItem(365, 100, prixAra -1)
		end

	global:leaveDialog()
end