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Pontia sp.
It is either Pontia daplidice OR Pontia edusa. Impossible to ID. One criteria would be the geographical range with Daplidice being more in the western part of the mediterranean area whereas Edusa is more in the eastern part. And you are in the middle! And since it is a migrant butterfly this might be the ne or the other. There are further studies needed in the discussion about the taxonomy of the whole group of Daplidice (30 species!).