Challenge 59

The smoker

Difficulty level:

Ana Carolina is a big smoker, however decided to quit smoking. "I'll finish the twenty-seven cigarettes left over!" And said, "I'll never smoke again." It was Ana Carolina's habit to smoke exactly two thirds of each cigarette. It was not long before he discovered that with the help of an adhesive tape he could gather three stumps of cigarettes and make another cigarette. With 27 cigarettes, how many can you smoke before quitting forever?

O Just Math warns:

Smoking is harmful to health.