Problems
Value of variable 4
Value of variable 4
Find the value of the variable $y$ for a given real value of the variable $x$.
$$
y = {2x - 1 \over x^2} + {\sqrt{x^2 + 1} \over 2}
$$
\InputFile
Value of the variable $x$.
\OutputFile
Print the value of the variable $y$ up to thousandths.
Input example #1
1
Output example #1
1.707