The toothpaste factory changed the diameter of the toothpaste mouth from 0.4 cm to 0.5 cm. If the length of toothpaste used by each person is about 2 centimeters per day, how many cubic centimeters of toothpaste will each person use in a year?
牙膏厂将牙膏口的直径由原来的0.4厘米改成0.5厘米．如果每人每天使用牙膏的长度是2厘米左右，一年里，每个人大约要比原来多用去多少立方厘米牙膏？
<gadget id="calculator">0.5 / 2</gadget>
<output>0.25</output>

<gadget id="calculator">0.25 ** 2</gadget>
<output>0.0625</output>

<gadget id="calculator">3.14 * 0.0625 * 2</gadget>
<output>0.3925</output>

<gadget id="calculator">0.4 / 2</gadget>
<output>0.2</output>

<gadget id="calculator">0.2 ** 2</gadget>
<output>0.04</output>

<gadget id="calculator">3.14 * 0.04 * 2</gadget>
<output>0.2512</output>

<gadget id="calculator">0.3925 - 0.2512</gadget>
<output>0.1413</output>

<gadget id="calculator">0.1413 * 365</gadget>
<output>51.5745</output>

<result>51.5745</result>