Pyramids#882
The pyramids in this problem have a triangular base, making them tetrahedrons. Compute the volume of the pyramid based on the given edge lengths.
The first line contains numbers separated by spaces, representing the lengths of the edges of pyramid . The edges are listed in the following order: , , , , , . Each edge length is a positive integer not exceeding .
Output a single real number — the volume of the pyramid, rounded to four decimal places.
Example 1