Technician Wang originally designed a cylindrical oil barrel with the same bottom perimeter and height. As a result, when discussing the plan, it was found that this was too high, so the height was reduced by 50 cm, which is not only beautiful and practical, but also saves 314 square decimeters of iron sheet. What is the maximum volume of the oil barrel now?
王技师原设计做一个底面周长和高都相等的圆柱形油桶．结果讨论方案时发现这样做太高了，于是将高度降低50厘米，这样不仅美观实用，而且还可以节省314平方分米铁皮．现在这个油桶的容积最大是多少平方分米？
<gadget id="calculator">50 / 10</gadget>
<output>5</output>

<gadget id="calculator">314 / 5 / 3.14 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 57.5</gadget>
<output>18_055</output>

<result>18_055</result>