According to the rules:
http://concours.ref-union.org/reglements/actuels/reg_cdfhf_dx.pdf1. Objective
[...]
Foreign amateurs work as many F stations in as many of the 97 metropolitans departments
(including F6REF HQ) and overseas French territories (DOM/TOM) as possible.
French stations get more points if they work each other than for working non-F-stations but every QSO counts.
73
Fabian