This Equation Has a Property .

$x^3 + px^2 + qx + r$

In the given equation, it has the properties that :
1. If $k$ is a root, then $k^{-1}$ is a root.
2. If m is a root, $1 - m$ is also a root.

If the sum of the possible values of $p + q + r$ , is denoted as $n$ , Find the value of $n$