# Cleaning time!

**Algebra**Level pending

**Mai** and **Mio** decided to earn some money by cleaning a local warehouse. Inside area of the warehouse is **36 thousands** square units (as shown in the image above, shape of warehouse from the bird perspective is similar to a rectangle with sides of **180** and **200** units).

Here is the plan: Mai and Mio will start cleaning from points \( D \) (red point) and \( C \) (blue point), respectively, each one will be heading **down** and when wall is reached, Mai will go one square unit **right** and Mio one **left**, ater that, both will go **up**. When wall is reached, Mai goes **right**, Mio **left**, and both will go **down** again and so on, until they clean the warehouse.

Mai will clean **11**, whilst Mio, for the same time, will clean **7** square units. At the moment when work is finished, how many square units will be between Mai and the wall marked \( AB \) (a square unit on which Mai will be standing in that moment is not included in that number)?

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