A stone is placed in a cylindrical container with a bottom circumference of 125.6 cm and filled with water. If the water level rises by 1 cm, what is the volume of the stone in cubic centimeters?
把一个石块放入底面周长为125.6厘米装有水的圆柱形容器中，水面升高1厘米，石块的体积是多少立方厘米．
<gadget id="calculator">125.6 / 3.14 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">3.14 * 400 * 1</gadget>
<output>1_256</output>

<result>1_256</result>