Paste label paper on the sides of a cube box with a side length of 15 cm. What is the area of the label paper in square centimeters?
给一个棱长是15cm的正方体盒子的四周贴上商标纸，贴商标纸的面积是多少平方厘米？
<gadget id="calculator">15 * 15 * 4</gadget>
<output>900</output>

<result>900</result>