Using multiple conditions in one if-statement in Ruby Language

I write something like this in Ruby:

if a.max == a[0] 
  brand = b[0]

elsif a.max == a[1]
  brand = b[1]
  

elsif a.max == a[2]
  brand = b[2]

elsif a.max == a[3]
  brand = b[3]
end

Is there any way to check all if and elsif's in the same condition? Only one condition for a[1], a[2], a[3] and a[0] ?