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PHILADELPHIA (CBS) — If you want some McDonald’s fries for free, here’s how you get to satisfy your appetite.

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You need to first download the McDonald’s app and register to be able to get the free offer.

The free medium-fry offer lasts every Friday until the end of the year with a minimum purchase of $1.

You can also enjoy other deals with app, including discounts like $1 McDoubles and coffees.