21-2
def F(x, y, p):
    if x + y >= 30 and p == 5:
        return True
    elif x + y < 30 and p == 5:
        return False
    elif x + y >= 30 and p == 3:
        return False

    if p % 2 == 1:
        return F(x + 3, y, p + 1) and F(x * 2, y, p + 1) and F(x, y + 3, p + 1) and F(x, y * 2, p + 1)
    else:
        return F(x + 3, y, p + 1) or F(x * 2, y, p + 1) or F(x, y + 3, p + 1) or F(x, y * 2, p + 1)


for s in range(1, 25):
    if F(5, s, 1) == True:
        print(s)