Xiao Ming's grandfather plans to order a cube goldfish tank without a cover, with a side length of 4 decimeters. Please help me calculate how many square decimeters of glass will be used?
小明的爷爷打算订做一个无盖的正方体金鱼缸，棱长4分米，请你帮忙算一算，要用玻璃多少平方分米呢？
<gadget id="calculator">4 * 4 * 5</gadget>
<output>80</output>

<result>80</result>