You were lucky and managed to find one of the most beautiful Old Town Markets in the world. It wasn’t hard, was it? 

Look around. You may be surprised but all these old buildings around you were carefully rebuilt after the World War II, so in fact they are only 70 years old. In 1944 it looked like this:

Constructors did a good job, didn’t they? Time for task , go to "The second mathematical task".