The binding factory has bound 1,800 Chinese textbooks, and the number of bound math textbooks is five times that of Chinese textbooks. How many more math textbooks than Chinese textbooks?
装订厂装订了语文课本1800本，装订的数学课本是语文课本的5倍，数学课本比语文课本多多少本？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">1_800 * 4</gadget>
<output>7_200</output>

<result>7_200</result>