The school bought 450 literature and art books, 370 reference books, and 298 story books less than the sum of literature and art books and reference books. How many story books did they buy?
学校买来文艺书450本，买来工具书370本，买来的故事书比文艺书和工具书的总和少298本，买故事书多少本？
<gadget id="calculator">370 - 298</gadget>
<output>72</output>

<gadget id="calculator">450 + 72</gadget>
<output>522</output>

<result>522</result>