There were 480 storybooks in the library, and 390 new ones were bought, and 286 were borrowed. How many storybooks are there now in the library?
图书馆原来有480本故事书，又新买了390本，借出286本后，图书馆现在有多少本故事书？
<gadget id="calculator">390 - 286</gadget>
<output>104</output>

<gadget id="calculator">480 + 104</gadget>
<output>584</output>

<result>584</result>