- Time limit: 1.00 s
- Memory limit: 512 MB
What is the last number you can write?
Input
The only input line contains the value of $n$.
Output
Print the last number you can write.
Constraints
- $1 \le n \le 10^{18}$
Input:
5
Output:
12
Explanation: You can write the numbers $1,2,\ldots,12$. This requires that you press key $1$ five times, so you cannot write the number $13$.