某自动售货机售A，B，C3种商品，他们的价格分别为1，3，4。

售票机进接受一元硬币。售货机面板上设有投币孔和退钱建，每种商品标识处有选择按键，上有指示灯表明当前投币说是否已经足够选买该商品。-A vending machine to sell A, B, C3 kinds of merchandise, their prices were 1,3,4. Into the ticket vending machines to accept one-dollar coins. Vending machines with coin panel hole and refund built, each Department has logo merchandise selection button, the indicator light shows the current coin has said the election has been enough to buy the merchandise.