Apply the old standby for amateurs : 1-18 and 25-36.
Place $ 15 on 1-18 and $ 10 on 25-36.
Fancy lunch : $ 75 on 1-18 and $ 50 on 3 rd dozen.
I you win 3 times in a row you stop and buy yourself lunch. I you have one loss : You are on a diet.
Enjoy either way.