Problem taken from DMOJ

Simon got a new drill recently. Everyone knows that a drill is shaped like a right circular cone. Simon knows his drill has radius ~r~ and height ~h~, But now he wants to calculate the volume. Write a program to help Simon!

Note: The formula for the volume of a cone is ~V=\frac{\pi r^2h}{3}~

Input Specification

The first line of input will have an integer ~r(1 \le r \le 100)~.

The second line of input will have an integer ~h(1 \le h \le 100)~.

Output Specification

The first line of output should have the volume of Simon's drill. Ensure that you are using ~\pi = 3.14~, otherwise your solution will be marked wrong.

Sample Input

3
5

Sample Output

47.1