square log with a cross-section of square, a cross-sectional area of 25 square decimeters, and a length of 8 meters, what is the maximum volume of a round log processed into cubic decimeters?
一根横截面为正方形，截面积为25平方分米，长为8米的方木，加工成最大圆木体积为多少立方分米．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) ** 2</gadget>
<output>25/4 = around 6.25</output>

<gadget id="calculator">3.14 * (25/4) * 8 * 10</gadget>
<output>1_570</output>

<result>1_570</result>