k = int(eval(input()))

cnt_odd = 0

cnt_even = 0

if k&1:

    while k >= 1:

        cnt_odd += 1

        k -= 2

    cnt_even = cnt_odd - 1

else:

    while k > 0:

        cnt_even += 1

        k -= 2

    cnt_odd = cnt_even



print((cnt_even * cnt_odd))
def main():

    N = int(eval(input()))

    odd = (N+1)//2

    even = N//2

    print((odd*even))





if __name__ == '__main__':

    main()

k = int(eval(input()))
cnt_odd = 0
cnt_even = 0
if k & 1:
    while k >= 1:
        cnt_odd += 1
        k -= 2
    cnt_even = cnt_odd - 1
else:
    while k > 0:
        cnt_even += 1
        k -= 2
    cnt_odd = cnt_even
print((cnt_even * cnt_odd))

def main():
    N = int(eval(input()))
    odd = (N + 1) // 2
    even = N // 2
    print((odd * even))


if __name__ == "__main__":
    main()

-k = int(eval(input())) -cnt_odd = 0 -cnt_even = 0 -if k & 1: -    while k >= 1: -        cnt_odd += 1 -        k -= 2 -    cnt_even = cnt_odd - 1 -else: -    while k > 0: -        cnt_even += 1 -        k -= 2 -    cnt_odd = cnt_even -print((cnt_even * cnt_odd)) +def main(): +    N = int(eval(input())) +    odd = (N + 1) // 2 +    even = N // 2 +    print((odd * even)) + + +if __name__ == "__main__": +    main()