A circular lake has a circumference of 3140 meters, and there is a small island with an area of 3000 square meters in the center of the lake. If the lake is filled with lotus flowers, 0.05 kilograms of lotus seeds can be harvested per square meter of water surface. How many kilograms of lotus seeds can be harvested in total?
某圆形湖周长3140米，在湖的中心有一个面积是3000平方米的小岛，如果在湖中种满莲花每平方米水面可以收莲子0.05千克，一共可以收莲子多少千克？
<gadget id="calculator">3_140 / 3.14 / 2</gadget>
<output>500</output>

<gadget id="calculator">500 ** 2</gadget>
<output>250_000</output>

<gadget id="calculator">3.14 * 250_000</gadget>
<output>785_000</output>

<gadget id="calculator">785_000 - 3_000</gadget>
<output>782_000</output>

<gadget id="calculator">782_000 * 0.05</gadget>
<output>39_100</output>

<result>39_100</result>