There is a cylindrical oil pipeline, each section is 30 meters long, and the diameter of the bottom surface is 0.5 meters. How many square meters of iron sheets are needed to produce 50 sections of such oil pipelines?
有一种圆柱形输油管，每节长30米，底面直径是0.5米，生产这样的输油管50节，至少需要多少平方米铁皮？
<gadget id="calculator">3.14 * 0.5 * 30 * 50</gadget>
<output>2_355</output>

<result>2_355</result>