It is possible to reach to any number, starting from 4. The operations are: Add 0 at the end of the number / Add 4 at the end of the number / Divide by 2 The order of these operations doesn`t matter and you can use them every time needed.
Example: N = 14 Starting with 4 -> 4 / 2 = 2 -> 2 / 2 = 1 -> 1 add 4 = 14