求f(x,n)
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Description
已知
$$f(x,n) = \sqrt{n + \sqrt{(n-1) + \sqrt{(n-2) + \cdots + \sqrt{2 + \sqrt{1 + x}}}}}$$
计算$x=4.2，n=10$以及$x=2.5，n=15$时的$f$的值。
Input Format
输入$x$和$n$。
Output Format
函数值，保留两位小数。
4.2 10
3.68