Dad wanted to figure out the volume of an apple, obviously thought about it, and came up with a good way. He took out a cube glass container with a side length of 1dm, put it into 5cm deep water, and then put the apple into the container, and found that the current water level is 8cm. According to this operation process, please help Mingming to calculate the volume of the apple.
爸爸要明明算出一个苹果的体积，明明想了想，想出一个好办法．他拿出一个棱长是1dm的正方体玻璃容器，放入5cm深的水，然后把苹果放入容器内，发现现在的水位是8cm，根据这个操作过程，请你帮明明算出苹果的体积．
<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<gadget id="calculator">1 * 10 * 1 * 10 * 3</gadget>
<output>300</output>

<result>300</result>