## 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.