An iron drum (with a lid), the bottom surface is a square with a side length of 0.6m, and a height of 1m. Label paper is pasted around the drum. What is the minimum area of the label paper?
一个铁桶(带盖)，底面是边长0.6m的正方形，高1m，在桶的四周贴上商标纸，所贴商标纸的面积至少是多少平方米？
<gadget id="calculator">0.6 * 4 * 1</gadget>
<output>2.4</output>

<result>2.4</result>