definiens: . Adjustment Factor shall mean for a given Calendar Quarter, on an Idenix HCV Product - by - Idenix HCV Product and country - by - country basis, the amount equal to [ * * ], where:[**]The Adjustment Factor shall be determined as follows : ( i ) for each of the countries for which Co - Prescription data isavailable from the relevant Data Source ( other than Brazil, Russia, India and China ( the ) ), theAdjustment Factor shall be based on Prescriptions and Co - Prescriptions for the applicable Idenix HCV Product in suchcountry, reported by the Data Source ; ( ii ) for each of Brazil, Russia, India and China, the Adjustment Factor shall bebased on Prescriptions and Co - Prescriptions for the applicable Idenix HCV Product in such country, reported by the DataSource ; and ( iii ) for any other country ( a ), the Adjustment Factor for a given Calendar Quarter shallbe equal to the weighted average of the Adjustment Factors for the countries described in the foregoing clause ( i ), wherethe components of such weighted average are calculated as follows:[**];provided, that, in no event shall any BRIC country be a No Data Country