Bootstrapping Number
Neelix has been working on making the Altonian warp bubble power itself up. While waiting for the system checks to complete, he saw a number on his screen and wondered if there is a number that powers itself up to this number.
Input
The first and only input line consists of a single integer $n$, the number Neelix saw on his screen.
Output
Output the number $x$, where $x^ x = n$. Your answer must have an absolute or relative error of at most $10^{6}$.
Limits

$1 \leq n \leq 10\, 000\, 000\, 000$
Sample Input 1  Sample Output 1 

4 
2.0 
Sample Input 2  Sample Output 2 

42 
3.20720196137 