A city is laid out with a rectangular grid of roads with 10 streets numbered from 1 to 10 running east-west and 16 avenues numbered from 1 to 16 running northsouth.  All streets end at First and Sixteenth Avenues, and all avenues end at First and Tenth Streets.  A rectangular city park is bounded on the north and south by Sixth Street and Eighth Street, and bounded on the east and west by Fourth Avenue and Twelfth Avenue. Although there are no breaks in the roads that bound the park, no road goes through the park.  The city paints a crosswalk from every street corner across any adjacent road.  Thus, where two roads cross such as at Second Street and Second Avenue, there are four crosswalks painted, while at corners such as First Street and First Avenue, there are only two crosswalks painted.  
How many crosswalks are there painted on the roads of this city?

Let's think step by step and output the final answer within \boxed{}.
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