Untitled

def f(n):
    if n == 1:
        return 2
    if n == 2:
        return 3
    if n % 2 != 0 and n > 2:
        return int(f(n - 2) + f(n - 2) / 7)
    if n % 2 == 0 and n > 2:
        return 7 * n - int(f(n - 1) / 2 + 5)
print(f(40))