Clock Math

Given a time (hours as $H$ and minutes as $M$), determine the smaller angle between the two hands of a clock showing the time and print it.

Input

The input will contain two integers: $H$ ($0 \le H < 12$) and $M$ ($0 \le M < 60$).

Output

Print the angle in degrees (positive and accurate to $10^{-4}$).

Sample

10 15

142.5000000