The function f is defined on the positive integers as follows:

1. f(1) = 1, and:
2. f(2n) = f(n), if n is even, and:
3. f(2n) = 2*f(n), if n is odd, and:
4. f(2n + 1) = 2*f(n) + 1, if n is even, and:
5. f(2n + 1) = f(n), if n is odd, and:

Determine the number of positive integers n which are less than 2015 and have the property that f(n) = f(2015).