A tin "love box", 60cm long, 40cm wide, and 35cm high. At least how many square centimeters of iron sheets are needed to make this "love box".
一个铁皮"爱心箱"，长60cm，宽40cm，高35cm．做这个"爱心箱"至少需要多少平方厘米的铁皮．
<gadget id="calculator">60 * 40</gadget>
<output>2_400</output>

<gadget id="calculator">60 * 35</gadget>
<output>2_100</output>

<gadget id="calculator">40 * 35</gadget>
<output>1_400</output>

<gadget id="calculator">2_400 + 2_100 + 1_400</gadget>
<output>5_900</output>

<gadget id="calculator">5_900 * 2</gadget>
<output>11_800</output>

<result>11_800</result>