Problem P
Painting the roof

Roof platform

You are painting your roof. You have a $10$ liter can of paint that is filled to the brim. That poses a bit of a problem because you can not put it down on the roof because it is tilted, otherwise the paint will spill. You decide to build a simple platform on which to place the can of paint. You already have one piece of plywood that is sized at $50\mathrm{cm}\times 50\mathrm{cm}$. You are going to screw another piece of wood at a right angle at the end of it to make the platform perfectly level while placed on the roof.

You have a cool app on your phone that allows you to measure the roof’s angle in degrees, denoted as $\mathrm{\Theta }$ in the diagram. Now it is time to put your programming skills to use to calculate the exact height of the second piece.

Hint: the math module in Python contains commonly used trigonometric functions.

Input

Input consists of one line with one integer $d$, the roof’s angle in degrees, where $0\le d<90$.

Output

Output consists of one line with one floating point number, the height of the second piece, rounded to 1 decimal place.

0

0.0

14

12.5

45

50.0