Additional question: There are 3 stories and 5 science books mixed in the book box. To ensure that 2 story books can be taken out at a time, how many books should be taken out at most?
附加题：书箱里混装着3本故事和5本科技书，要保证一次一定能拿出2本故事书，最多要拿出多少本书？
<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<result>7</result>