Master Li wants to process 5 sections of rectangular parallelepiped exhaust chimneys. The length and width of each section of the chimney are 0.3 meters and the height is 1 meter. How much iron sheet does Master Li need at least to make these chimneys?
李师傅要加工5节长方体形状的排气烟囱，每节烟囱的长和宽都是0.3米，高为1米．李师傅做这些烟囱至少需要多少铁皮？
<gadget id="calculator">0.3 * 1</gadget>
<output>0.3</output>

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

<gadget id="calculator">0.6 * 2 * 5</gadget>
<output>6</output>

<result>6</result>