A furniture maker has 6 wood panels and 30 hours of free time: He sells two types of cabinets made from these panels. The first cabinet requires 2 pieces of panels and 7 hoürs. The second cabinet requires a piece of plate and 8 hours. The selling price of the cabinet is 120 euros and the second cabinet is 80 euros. Since the furniture maker wants to maximize its sales, how many pieces should it sell in both models?