It is known that the charging standard of taxis is: the starting price is 3 kilometers/5 yuan (that is, 5 yuan is paid within 3 kilometers), and the fee is 1.6 yuan per kilometer thereafter. Teacher Li took a taxi from the school to Sanyu Town, 18 kilometers away, due to an emergency. How much should I pay for the taxi?
已知出租车的收费标准为：起步价3千米/5元(即3千米内付费5元)，以后每千米收费1.6元．李老师因急事坐出租车从学校去18千米外的三余镇，应付车费多少元？
<gadget id="calculator">18 - 3</gadget>
<output>15</output>

<gadget id="calculator">15 * 1.6</gadget>
<output>24</output>

<gadget id="calculator">24 + 5</gadget>
<output>29</output>

<result>29</result>