A square log is 3 meters long and its base is a square with a side length of 3 decimeters. What is its volume in cubic decimeters?
一根方木长3米，底面为边长3分米的正方形，它的体积是多少立方分米．
<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">3 * 3 * 30</gadget>
<output>270</output>

<result>270</result>