The decimal number system uses the characters 0, 1, 2, …, 8, 9, and the octal…

The decimal number system uses the characters 0, 1, 2, …, 8, 9, and the octal number system uses the characters 0, 1, 2, …, 6, 7. For example, the decimal number 12 ( = 1 × 101 + 2 × 100 ) is expressed as 14 ( = 1 × 81 + 4 × 80 ) in the octal number system. The decimal number 108 in the octal number system is