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If your Schengen Visa only allows you to stay 13 days (during which you may enter multiple times) and you have used all 13 days then you have 0 days left.
With that you cannot reenter the Schengen Area.
Non-Schengen countries that have this rule, expect you to be able to return to the Schengen Area.
Having exhausted the amount of days allowed, you cannot use this Visa for a visit to these countries.