The formula bar for calculated specs can handle the 4 basic math operations +, - , * , /
The notation for calculating balloon numbers is #balloon OPERATOR #balloon (I.e. #3 + #6). You can also use static numbers (I.e. #4 * 2)
You can have multiple operators within one line (I.e. #1 + #2 + #3), but parentheses are not recognized and you will need to make sure the order of operations result as planned
