There is a planet in the universe that uses Base 3 notation. When Mr. Lv moved to this planet and changed his ID card, he had to change his age from Base 10 to Base 3 notation. Mr. Lv found that, as long as the original Base 10 age added a "0 " at the end, is the age in Base 3. How old is Mr. Lv? 
Overseas Competition->Knowledge Point->Number Theory Modules