A cylindrical tin bucket without a lid, 3.5 decimeters high and 2 decimeters in diameter at the bottom. To paint a layer of anti-rust paint on the outer surface of the bucket, about 6 grams of anti-rust paint is needed per square decimeter. How many grams of anti-rust paint is needed to paint this bucket?
一个无盖的圆柱形铁皮水桶，高3.5分米，底面直径2分米．要在水桶的外表面刷一层防锈漆，每平方分米大约需防锈漆6克，刷这个水桶需要防锈漆多少克？
<gadget id="calculator">3.14 * 2 * 3.5</gadget>
<output>21.98</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

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

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<gadget id="calculator">21.98 + 3.14</gadget>
<output>25.12</output>

<gadget id="calculator">25.12 * 6</gadget>
<output>150.72</output>

<result>150.72</result>