This year's Mother's Day, Xiao Chang bought a cuboid gift for her mother with a length, width, and height of 5 cm. To wrap this gift, at least how many square centimeters of gift wrapping paper is needed.
今年母亲节，小畅为母亲买了一件长、宽都是10厘米，高是5厘米的长方体礼物，要包装这个礼物，至少需要多少平方厘米的礼品包装纸．
<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">10 * 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>