Hello, the inbound and outbound journeys are indeed taken into account when purchasing the Interrail pass. Based on your itinerary of Paris to Milan (Italy); Milan to Bari (Italy); Bari to Patras (Greece); Patras to Milan; Milan to Paris, it appears that you would need a 5 days within 1 month pass or a 3 days within 1 month pass.
number of days to take - incoming country / outgoing country
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