If the surface of a cuboid iron drum without a cover is 7 decimeters long, 5 decimeters wide, and 12 decimeters high, how many square decimeters of paint need to be sprayed at least?
一个长7分米，宽5分米，高12分米的无盖长方体铁桶的表面喷上油漆，至少需要喷多少平方分米油漆？
<gadget id="calculator">7 * 5</gadget>
<output>35</output>

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

<gadget id="calculator">12 * 5</gadget>
<output>60</output>

<gadget id="calculator">84 + 60</gadget>
<output>144</output>

<gadget id="calculator">144 * 2</gadget>
<output>288</output>

<gadget id="calculator">35 + 288</gadget>
<output>323</output>

<result>323</result>