plz i want help in this problem i can't understand it

Code:

There are G girl students and B boy students in a class that is about to graduate. You
need to arrange them in a single row for the graduation. To give a better impression of
diversity, you want to avoid having too many girls or too many boys seating consecutively.
You decided to arrange the students in order to minimize the gender regularity. The
gender regularity of an arrangement is the maximum number of students of the same
gender (all girls or all boys) that appear consecutively.
Given G and B, calculate the minimum gender regularity among all possible arrange-
ments.

the example

Code:

G = 5 , B = 1
result = 3