(By '^4' I mean 'to the power of 4'. Dunno how to type it.)
更新1:
and to 'adambing81', I am worrying about this on a Sunday because I have my maths GCSE tomorrow. Maybe you should think it through before you decide to insult someone because of the day on which they choose to revise maths, because now you've made yourself sound like a right idiot.