A copy of "Fairy Tale" is 13.5 yuan, a copy of "Sea World" is 4.69 yuan, and a copy of soft cover is 2.5 yuan. How much does it cost to buy these three things?
一本《童话故事》13.5元，一本《海洋世界》4.69元，一本软皮抄2.5元，买这三样东西需要多少钱？
<gadget id="calculator">13.5 + 4.69 + 2.5</gadget>
<output>20.69</output>

<result>20.69</result>