Problems
Value of expression 3
Value of expression 3
Find the value of expression for the given values of the variables $x$ and $y$.
$$
{2x + y \over x^2 - xy + 4y^2} + {2x^2 - xy + y^2 \over x + 4y}
$$
\InputFile
Values of the variables $x$ and $y$.
\OutputFile
Print the value of expression up to thousandths.
Input example #1
1.000 -2.000
Output example #1
-1.143