After getting up on Sunday morning, Xiaohong arranged to do these things: sweeping the floor for 3 minutes, washing the floor for 12 minutes, boiling water for 8 minutes, and packing schoolbag for 2 minutes. In order to get things done earlier, how many minutes should she use at least in the most reasonable arrangement.
星期天早上起床后，小红安排做这些事：扫地用3分钟，洗地板用12分钟，烧开水要用8分钟，整理书包用2分钟．为了早一点把事做完，她最合理的安排至少要用多少分钟．
<gadget id="calculator">3 + 12 + 2</gadget>
<output>17</output>

<result>17</result>