k= int(eval(input()))

if k% 2 == 0:

    print((int((k/2)**2)))



elif k%2 ==1:



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

i=K//2

if (K%2==0):

    print((i**2))

else:

    print(((i**2)+i))

    
k = int(eval(input()))
if k % 2 == 0:
    print((int((k / 2) ** 2)))
elif k % 2 == 1:
    print(((k // 2) * (k - k // 2)))

K = int(eval(input()))
i = K // 2
if K % 2 == 0:
    print((i**2))
else:
    print(((i**2) + i))

-k = int(eval(input())) -if k % 2 == 0: -    print((int((k / 2) ** 2))) -elif k % 2 == 1: -    print(((k // 2) * (k - k // 2))) +K = int(eval(input())) +i = K // 2 +if K % 2 == 0: +    print((i**2)) +else: +    print(((i**2) + i))