There is a cuboid wooden stick with a length of 3 meters and a cross-section of a square with a side length of 4 decimeters. If it is processed into the largest log. How many cubic decimeters need to be trimmed?
有一条长方体木棍，长3米，横截面是边长4分米的正方形，如果把它加工成一根最大的圆木．需要削掉多少立方分米？
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

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

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

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">16 - 12.56</gadget>
<output>3.44</output>

<gadget id="calculator">3.44 * 3 * 10</gadget>
<output>103.2</output>

<result>103.2</result>