A fat mouse prepared M pounds of cat food,ready to trade with the cats guarding the warehouse containing his
favorite food:peanut. The warehouse has N rooms.The ith room containsW[i] pounds of peanut and requires
F[i] pounds of cat food. Fatmouse does not have to trade for all the peanut in the room,instead,he may get
W[i]*a% pounds of peanut if he pays F[i]*a% pounds of cat food.The mouse is a stupid mouse,so can you tell
him the maximum amount of peanut he can obtain.