$3.(8$ points$)$ Consider the following three threads executing concurrently in the same process. Semaphore t has been initialized to $1,$ while semaphore s has been initialized to $0.$ Thread $1$ P$($&t$)$; n $*=2$; V$($&t$)$; Thread $2$ P$($&t$)$; n $+=5$; V$($&s$)$; V$($&t$)$; Thread $3$ P$($&s$)$; P$($&t$)$; n$-=3$; V$($&t$)$; Enumerate the possible values of global variable n after all three threads have terminated. The value of n is initialized to $2.$