Fizz Buzz sum

Given N, sum the integers 1 to N that are multiples of 3, or multiples of 5, but not both.

For example, if N=16, you would return 3+5+6+9+10+12 = 45. Note that you would not include 15 in the sum, as it is a multiple of both 3 and 5.

Put the sum in r2, then execute the break instruction.