L = int(eval(input()))



import random



print((L**3/27))
l = int(eval(input()))

print(((l/3)**3))
L = int(eval(input()))
import random

print((L**3 / 27))

l = int(eval(input()))
print(((l / 3) ** 3))

-L = int(eval(input())) -import random - -print((L**3 / 27)) +l = int(eval(input())) +print(((l / 3) ** 3))