s= int(eval(input()))

if s%2==0:

    print((int((s//2)**2)))

else:

    print((int((s//2)*(s//2+1))))



K = int(eval(input()))

x = 0

for i in range (0,K,1):

    if i % 2 == 0:

        x +=1

sum = x * (K-x)

print(sum)
s = int(eval(input()))
if s % 2 == 0:
    print((int((s // 2) ** 2)))
else:
    print((int((s // 2) * (s // 2 + 1))))

K = int(eval(input()))
x = 0
for i in range(0, K, 1):
    if i % 2 == 0:
        x += 1
sum = x * (K - x)
print(sum)

-s = int(eval(input())) -if s % 2 == 0: -    print((int((s // 2) ** 2))) -else: -    print((int((s // 2) * (s // 2 + 1)))) +K = int(eval(input())) +x = 0 +for i in range(0, K, 1): +    if i % 2 == 0: +        x += 1 +sum = x * (K - x) +print(sum)