def f(a, m):
    if a >= 30:
        return m % 2 == 0
    if m == 0:
        return 0
    h = [f(a+1, m-1), f(a*2, m-1)]
    return any(h) if (m-1) % 2 == 0 else all(h)
print([s for s in range(1, 30) if f(s, 4)])