Paint the city

The chef has been kicked out of his Restaurant De Café and is looking for a job to earn a living. He needs to earn N amount of money for his expenses which include his rent, his children’s education, his wife’s dramas and his quench for ladoos! Luckily our chef finds a job of painting the Outer Walls and the Rooftops only of each of the buildings in the entire city. Now a fun fact about this city