A cuboid iron box is 18 cm long, 15 cm wide, and 10 cm high. How many square centimeters of iron sheet should be used to make this iron box?
一个长方体铁盒长18厘米，宽15厘米，高10厘米，做这个铁盒至少用多少平方厘米的铁皮？
<gadget id="calculator">18 * 15</gadget>
<output>270</output>

<gadget id="calculator">18 * 10</gadget>
<output>180</output>

<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<gadget id="calculator">270 + 180 + 150</gadget>
<output>600</output>

<gadget id="calculator">600 * 2</gadget>
<output>1_200</output>

<result>1_200</result>