Students in class 5 and 1 pasted red paper on each side of a cube carton with a side length of 40 cm, and used it as a "love box" to raise donations for Hope Primary School. How many square centimeters of red paper do they need at least?
五1班同学把一个棱长为40厘米的正方体纸箱的各面都贴上红纸，将它作为给希望小学募捐的"爱心箱"，他们至少需要多少平方厘米的红纸？
<gadget id="calculator">40 * 40 * 6</gadget>
<output>9_600</output>

<result>9_600</result>