求由以下两条抛物线所围成区域的面积：$y = (x - a)^2$ 和 $x = (y - a)^2$。
输入格式
第一行包含一个整数 $a$ ($1 \le a \le 10^{18}$)。
输出格式
输出问题的答案，保留小数点后恰好 10 位，并使用标准的四舍五入规则。
样例
样例输入 1
2
样例输出 1
7.6666666667
QOJ.ac
QOJ
Limite de temps : 1 s
Limite de mémoire : 256 MB
Points totaux : 100
#8423. 抛物线的交点
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