The inner radius of the water pipe is 1 cm, and the flow rate of water in the water pipe is 30 dm per minute. A classmate went to the sink to wash his hands and forgot to turn off the tap when he left. How many liters of water was wasted in 5 minutes?
自来水管的内半径是1cm，水管内水的流速是每分30dm．一位同学去水池洗手，走时忘记关掉水龙头，5分浪费多少升水．
<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">5 * 30 * 10</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 / 1_000</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">3.14 * 1 * (3/2)</gadget>
<output>4.71</output>

<result>4.71</result>