A milk carton is 7 cm long, 4 cm wide, and 12 cm high. How many square centimeters of cardboard are needed to make such a milk carton?
一个牛奶盒长7厘米，宽4厘米，高12厘米，做这样一个牛奶盒需要纸板多少平方厘米？
<gadget id="calculator">7 * 4</gadget>
<output>28</output>

<gadget id="calculator">7 * 12</gadget>
<output>84</output>

<gadget id="calculator">4 * 12</gadget>
<output>48</output>

<gadget id="calculator">28 + 84 + 48</gadget>
<output>160</output>

<gadget id="calculator">160 * 2</gadget>
<output>320</output>

<result>320</result>