Now this is a ridiculous number - the population should be around 19mil. Now am I misunderstanding something there (I think not), or has it been incorrectly put into the rules page? From fiddling around it seems that this fits the numbers better:

Wrong order of operations....
1. (flats^2)
2. then, do the natural logarithm on the number of flats
3. then, multiple answer 1 and 2
4. then, add flats.