Given a natural number N not greater than 10
8 . It is required to determine how many even digits are included in its entry in the ternary number system.
Input
number N written in decimal notation.
Imprint
the number of even digits included in the record of the number N in the ternary number system.
Examples
| # |
Input |
Output |
Explanation |
| 1 |
4 |
0 |
410=113 |
| 2 |
15 |
2 |
1510=1203 |