Score : 300 points
Given is a positive integer L. Find the maximum possible volume of a rectangular cuboid whose sum of the dimensions (not necessarily integers) is L.
Input is given from Standard Input in the following format:
L
Print the maximum possible volume of a rectangular cuboid whose sum of the dimensions (not necessarily integers) is L. Your output is considered correct if its absolute or relative error from our answer is at most 10^{-6}.
3
1.000000000000
For example, a rectangular cuboid whose dimensions are 0.8, 1, and 1.2 has a volume of 0.96.
On the other hand, if the dimensions are 1, 1, and 1, the volume of the rectangular cuboid is 1, which is greater.
999
36926037.000000000000