N has a parking strip of parking cars, it can be only one door for vehicular access. Vehicles to reach the car park by the time sooner or later followed by the most from the car park inside the main door to the big park (the first arrival of the first car on the parking lot of the inside). If the car park has been full of cars n, then the vehicle was only in the parking lot outside the gate waiting for the road, once the car park a car drive away, then came in on the sidewalk on the first car into the garage. If there is a car park vehicles to drive away, after it entered the parking lot of the cars have to be first out of the car park to make way for it, wait out the car park, these vehicles according to the order of the original approach.

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