finding number in list?

I am using values to set permissions on my site. Sometimes a page can be
viewed by several different permission codes. How can I write:

If permisscode = (1 or 2 or 3) then ...

..oO(r)

I am using values to set permissions on my site. Sometimes a page can be
viewed by several different permission codes. How can I write:

If permisscode = (1 or 2 or 3) then ...

Depends on the language. What do you have available?

Micha