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# Rectangle Area

Given diagonal corners of a rectangle with sides parallel to the $X$ and $Y$ axes, compute the area of the rectangle.

## Input

The single line of input contains four real numbers $x1$, $y1$, $x2$ and $y2$ ($|x1|,|y1|,|x2|,|y2| \le 100.0$), where $(x1,y1)$ and $(x2,y2)$ are diagonal corners of a rectangle with sides parallel to the $X$ and $Y$ axes. The rectangle is guaranteed to have an area greater than $0.01$.

## Output

Output a single line with a single real number, which is the area of the given rectangle. This number must be accurate to within $10^{-2}$ absolute or relative error.

Sample Input 1 Sample Output 1
0.0 0.0 3.0 4.0

12.000

Sample Input 2 Sample Output 2
5.2 -4.64 -3.47 2.2

59.303

CPU Time limit 1 second
Memory limit 2048 MB
Difficulty 1.7easy
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