Crossing a border to a nonvalidated country

Suppose I have a valid 5 country Pass. Italy is my 5th country. I'm in Genoa, and decide to go to Marseilles, France. I don't want to pay a fine for an invalid pass in France, so what happens at the French border? Do I have to pay for a ticket from Genoa to Marseilles, or only pay for the distance from the Italian border to Marseilles?

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