Problems
Square root
Square root
Find such number $x$ that $x^2 + \sqrt{x} = C$ with no less than $6$ digits after the decimal point.
\InputFile
One real number $С~(1.0 \le C \le 10^{10})$.
\OutputFile
Print the root $x$ with no less than $6$ digits after the decimal point.
Input example #1
2.0000000000
Output example #1
1.000000000
Input example #2
18.0000000000
Output example #2
4.000000000