A total of 800 books were purchased in the reading room of the school, including 347 science and technology books, 360 story books, and the rest are teachers' books. How many books are there for teachers?
学校阅览室共买书800册，其中科技书347册，故事书360册，其余的是教师用书，教师用书有多少册？
<gadget id="calculator">800 - 347 - 360</gadget>
<output>93</output>

<result>93</result>