The squadron members of the class pasted red paper on each side of a cube carton with a side length of 30 cm, and used them as "love boxes" to raise donations for the Yushu disaster area. At least how many square centimeters of red paper is needed?
班级中队委员把一个棱长30厘米的正方体纸箱各面都贴上红纸，将它们作为给玉树灾区募捐的"爱心箱"．至少需要多少平方厘米的红纸？
<gadget id="calculator">30 * 30 * 6</gadget>
<output>5_400</output>

<result>5_400</result>