Problem F: 求f(x,n)

Problem F: 求f(x,n)

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 625  Solved: 509
[Submit] [Status] [Web Board] [Creator:]

Description

Input

一行2个数，分别是输入浮点数x和整数n。

Output

函数值，保留两位小数。

Sample Input Copy 

4.2 10

Sample Output Copy 

3.68
[Submit][Status]