How many liters of paint must you buy to paint the walls of a rectangular​ prism-shaped room that is 20 m by 14 m with a ceiling height of 8 m if 1 L of paint covers 40 m2​? ​(Assume there are no doors or windows and paint comes in​ 1-L cans.) The amount of paint needed is _______liters. ​(Round up to the nearest integer as​ needed.)

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