Multiple Mid-Tier Servers in a load-balanced environment: licensing?

[ARS Bob]

** How many Mid-Tier licenses would I need for the setup diagrammed below?  I imagine it would be 6, one for each MT on each ARS.  Would that be 6 times more expensive than a simple "Internet-->MT-->ARS-->DB" setup, or does the one license fee cover it?

[[-Internet-]]
      |
      |
      v
  Load Balancer
      |
      |
      v
  /---|---\
 3 Web Servers
 with Mid-Tier
  \---|---/
      |
      v
  Load Balancer
      |
     / \
    /   \
 2 AR Servers
    \   /
     \ /
      |
      v
 1 Oracle DB

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