[Sanady]

Hello.Today I created my Material Shop.It`s working perfect.But when zombies come there they need to sell materials.But if I check how many materials have that zombie.And example that zombie have 3 materials.And he want to sell them all.And one material costs 500$ example.How can I check how many materials have if he have 3 just to sell them for some 1500 dollars how can I make it!(OMG Sorry I am bad with explaining!)