The integer sequence a1, a2, a3, ... satisfies a(n+2) = a(n+1) - a(n) for n > 0. The sum of the first 1492 terms is 1985, and the sum of the first 1985 terms is 1492. The sum of the first 2001 terms is

1) 986
2) 0
3) 1476
4) None of these