n = int(eval(input()))



print(((n // 2) * (n - n // 2)))
k = int(eval(input()))



even = k // 2

odd = k - even



print((even * odd))
n = int(eval(input()))
print(((n // 2) * (n - n // 2)))

k = int(eval(input()))
even = k // 2
odd = k - even
print((even * odd))

-n = int(eval(input())) -print(((n // 2) * (n - n // 2))) +k = int(eval(input())) +even = k // 2 +odd = k - even +print((even * odd))