28. There were 2013 inhabitants on an island. Some of them were knights and the others were liars.
The knights always tell the truth and the liars always lie. Everyday, one of the inhabitants said:
"After my departure the number of knights on the island will equal the number of liars" and then
left the island. After 2013 days, there is nobody on the island. How many liars were there initially?
(A) O
(B) 1006
(E) It is impossible to determine.
(C) 1007
(D) 2013