A cylindrical oil tank was originally 8 decimeters high, but now it needs to be increased by 5 decimeters, so that the surface area will increase by 62.8 square decimeters. What is the current volume of the oil tank in liters?
一个圆柱形油缺罐原来高8分米，现在需要加高5分米，这样表面积会增加62.8平方分米，油罐现在的容积是多少升？
<gadget id="calculator">62.8 / 5</gadget>
<output>12.56</output>

<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">8 + 5</gadget>
<output>13</output>

<gadget id="calculator">3.14 * 4 * 13</gadget>
<output>163.28</output>

<result>163.28</result>