n = int(input())

mod = 10 ** 9 + 7

x = 1
y = 0
if n == 1:
    print(1)
    exit()
for i in range(2, n - 1, 2):
    y += i * x
    x += (i + 1) * y

if n % 2:
    y += (n - 1) * x
    print(n * y)

else:
    print(n * x)