Use case for allow user to access different screens on the basis of roles

I have three roles assigned to users.
(1) R1
(2) R2
(3) R3

Now I want to allow user with r1 role to access pages P1,P2,P3.
user with R2 role to access pages P1, P4.
User with R3 role to access plage p5.

How to create the use case for this scenario.

P1 will allow roles R1 and R2
P2 and P3 will allow role R1
P4 will allow R2
and P5 will allow R3

you can check video: 
Hi Pedro,

Thanks for your reply but I Need the Use Case diagram and use cases for this scenario only.