certain book is 20 centimeters long, 12 centimeters wide, and 2.5 centimeters thick. If you pack four books like this into a pack, how many square centimeters of wrapping paper do you need at least?
某种书长20厘米、宽12厘米、厚2.5厘米，现将这样的4本书包装成一包，至少需要多少平方厘米的包装纸？
<gadget id="calculator">20 * 12</gadget>
<output>240</output>

<gadget id="calculator">2.5 * 4</gadget>
<output>10</output>

<gadget id="calculator">20 * 10</gadget>
<output>200</output>

<gadget id="calculator">12 * 10</gadget>
<output>120</output>

<gadget id="calculator">240 + 200 + 120</gadget>
<output>560</output>

<gadget id="calculator">560 * 2</gadget>
<output>1_120</output>

<result>1_120</result>