Given a sequence of number

Given a sequence of numbers: 1, 2, 3, 4, 5, 2, 3, 4, 5, 6, 3, 4, 5¸ 6, 7, 4, 5, 
6, 7, 8, . Following this pattern, what is the 2015th number in this sequence? 
(A) 404 (B) 405 (C) 406 (D) 407