1. (2020·哈尔滨模拟) Xiaolei wants to use his money, 256 yuan from the Wechat red envelop(微信红包to buy necessary school things and leave as much money as possible. According to the ta­ble of the school thing he has to buy, he can leave ____________ more yuan if he buys the smallest necessary number of school things.   

School things	Books	Pens	2B pencils	Pen bag	Compass	Rule tools
Price ( ¥ ) ( each )	1	2	0.5	10	6	5
Number	10-20	5-7	5-10	1-2	1 -2	4