329. Construct an example of a polynomial $P(x)$ of the third degree with integer coefficients and the leading coefficient equal to 1, which is divisible by 3 for all integer values of $x$.
$\triangle$ For example, we can take

$$
P(x)=x(x+1)(x+2)
$$

Among three consecutive integers $x, x+1$, and $x+2$, one is divisible by 3.