To make a cuboid carton, the length is 1m, the width is 0.6m, and the height is 0.5m. How many square meters of cardboard are needed to make this carton?
做一个长方体的纸箱，长1m，宽0.6m，高0.5m，做这个纸箱至少需要纸板多少平方米？
<gadget id="calculator">1 * 0.6</gadget>
<output>0.6</output>

<gadget id="calculator">1 * 0.5</gadget>
<output>0.5</output>

<gadget id="calculator">0.6 * 0.5</gadget>
<output>0.3</output>

<gadget id="calculator">0.6 + 0.5 + 0.3</gadget>
<output>1.4</output>

<gadget id="calculator">1.4 * 2</gadget>
<output>2.8</output>

<result>2.8</result>