Zhang Jian’s family has a cylindrical bucket with a bottom diameter and height of 4 decimeters. Zhang Jian first pours water 2.8 decimeters high into the bucket, and then puts a cube stone with a side length of 2.5 decimeters. Will the water overflow? If it does not overflow, how many liters of water must be poured in before the bucket is full?
张健家有一只底面直径和高都是4分米的圆柱形水桶，张健先在水桶里倒入2.8分米高的水，然后放入一块棱长是2.5分米的正方体石块，这时水桶里的水会溢出吗？如果不会溢出，还需要倒入多少升水，水桶才会满？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4 * 4</gadget>
<output>50.24</output>

<gadget id="calculator">50.798 - 50.24</gadget>
<output>0.558</output>

<result>0.558</result>