"""

https://yukicoder.me/problems/no/3042

"""


mod = 998244353


f = [0] * 2001

f[0] = 0
f[1] = 0

for i in range(2,2001):

    f[i] += f[i-1] + (i-1)

    for j in range(1,i):
        f[i] += f[j] + f[i-j]

N = int(input())
if N % 2 == 1:
    print (0)
else:
    print (f[N//2])