since I stated in the rules that partial coins count as full coins, your guess as written would be 166.
so... if you don't like that number (166)... edit it buddy
164 1/2 would be a valid guess if that is what you meant.
In other words, if I find 165 and someone else guessed 166, you would win by a half point.
Although... if anyone guesses in a 1/2 increment, they will be eliminated from the Bonus Prize chance because, by the rules, my total will not contain "1/2" because each partial coin counts as a hole coin.