A rectangular parallelepiped glass container whose bottom surface is 2 decimeters in length and width contains 5.6 liters of water, and an apple is submerged in the water. At this time, the water depth in the container is measured to be 1.5 decimeters. What is the volume of the apple in cubic decimeters?
一个底面长和宽都是2分米的长方体玻璃容器，里面装有5.6升水，再将一个苹果浸没在水中，这时量得容器内水深1.5分米，这个苹果的体积是多少立方分米？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">5.6 / 4</gadget>
<output>1.4</output>

<gadget id="calculator">1.5 - 1.4</gadget>
<output>0.1</output>

<gadget id="calculator">2 * 2 * 0.1</gadget>
<output>0.4</output>

<result>0.4</result>