Q9

The following two functions $P1$ and $P2$ that share a variable $B$ with an initial value of $2$ execute concurrently.

$$\begin{array}{|l|l|}\hline \text{P1() \{ } & \text{P2()\{} \\ \text{ C = B - 1;} & \text{ D = 2 * B; } \\ \text{ B = 2 * C;} & \text{ B = D - 1;} \\ \text{\}} & \text{\}} \\\hline \end{array}$$

The number of distinct values that $B$ can possibly take after the execution is______________________.