If the side length of a cube is increased by 3 times, the volume will increase by that many times.
正方体的棱长增加3倍，体积就增加多少倍．
<gadget id="calculator">1 * 1 * 1</gadget>
<output>1</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">4 * 4 * 4</gadget>
<output>64</output>

<gadget id="calculator">64 - 1</gadget>
<output>63</output>

<result>63</result>