There are 187 story books in the library, 54 are returned in the morning by the third grade, and 86 are borrowed by the fourth grade in the afternoon. How many story books are there in the library now?
图书馆有故事书187本，上午三年级还回54本，下午四年级借走86本．现在图书馆还有故事书多少本？
<gadget id="calculator">54 - 86</gadget>
<output>-32</output>

<gadget id="calculator">187 + (-32)</gadget>
<output>155</output>

<result>155</result>