Value of expression 3#8833
Sign in

Value of expression 3

1 second
128 megabytes
Very easy

Find the value of expression for the given real values of the variables and .

{2x + y \over x^2 - xy + 4y^2} + {2x^2 - xy + y^2 \over x + 4y}

Input

Real values of the variables and .

Output

Print the value of expression up to thousandths.

Examples

Example 1

Loading
Loading