ASSIGNMENT $7$ need to draw flawchart

Consider the central server model shown below.

A process at CPU requests a disk I$/$O after completing an exponentially distributed service. It joins disk $0$ with probability $P1,$ disk $1$ with probability $P2$ and disk $2$ with probability $).$ After receiving an exponentially distributed service at a disk process goes back to CPU queue. This is a closed system with $N$ jobs circulating in the system. There is no blocking in the system $($that is the queue size including the one in service is greater than or equal to N$).$ Draw the flowchart of the system.

Y