The diameter of the bottom of this wooden barrel measured from the inside is 4 decimeters, and the height is 5 decimeters. There is a hole 2 decimeters from the mouth of the barrel. How many liters of water can this wooden barrel hold at most?
这个木桶从里面量底面直径是4分米，高5分米．距离桶口2分米的地方破了个洞，现在这个木桶最多能装多少升水？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">3.14 * 4 * 3</gadget>
<output>37.68</output>

<result>37.68</result>