The handicraft factory packs a handicraft decorative box with a length of 25 cm, a width of 20 cm, and a height of 5 cm. How many square centimeters of wrapping paper do you need to pack four together?
工艺品厂包装一种长是25厘米，宽是20厘米，高是5厘米的工艺品装饰盒．四个包装在一起，最少需要多少平方厘米包装纸？
<gadget id="calculator">20 + 20</gadget>
<output>40</output>

<gadget id="calculator">5 + 5</gadget>
<output>10</output>

<gadget id="calculator">40 * 10</gadget>
<output>400</output>

<gadget id="calculator">25 * 40</gadget>
<output>1_000</output>

<gadget id="calculator">25 * 10</gadget>
<output>250</output>

<gadget id="calculator">400 + 1_000 + 250</gadget>
<output>1_650</output>

<gadget id="calculator">1_650 * 2</gadget>
<output>3_300</output>

<result>3_300</result>