The length of the CD box is 10cm, the width is 10cm, and the thickness is 1cm. To pack such 5 boxes of CDs into a pack, how many square centimeters of wrapping paper do you need to wrap it well? (pasted place not counted)
光盘盒是长是10cm，宽10cm，厚1cm，要把这样的5盒光盘包装成一包，至少需要用多少平方厘米的包装纸才能包好？(黏贴处不计)
<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">10 * 1 * 5</gadget>
<output>50</output>

<gadget id="calculator">100 + 50 + 50</gadget>
<output>200</output>

<gadget id="calculator">200 * 2</gadget>
<output>400</output>

<result>400</result>