Simon got a new drill recently. Everyone knows that a drill is shaped like a right circular cone. Simon knows his drill has radius and height . But now he wants to calculate the volume. Write a program to help Simon!
The first line of input will have an integer .
The second line of input will have an integer .
The first line of output should have the volume of Simon's drill. The output will be accepted if it's within an absolute or relative error of .
is the volume of the right circular cone with radius and height .