def F_2(n):
    if n <= 1:
        return n
    else:
        return F_2(n-2) + F_2(n-1)
   
def F_3(n):
    return F_3(n)

def F_4(n):
    if n >= 7 :
        return 12
    return F_4(n+2) + 5

def F_7(n):
    if n < 100:
        return 123
    if n > 1000:
        return 321
    if n%2 == 0:
        return F_7(n+2) + 14
    return F_7(n-2) + 23

def F_8(n):
    if n < 100:
        return 123
    if n > 1000:
        return 321
    if n%2 == 0:
        return F_8(n+3) + 14
    return F_8(n-2) + 23

def C(n):
    print(f"Quero saber C({n})")
    if n <= 1 :
        return 1
    if n%2 == 0:
        return C(n//2)
    return C(3*n + 1)