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**Task** | Statistics

Time limit: | 1.00 s | Memory limit: | 512 MB |

You would like to write a list of positive integers $1,2,3,\ldots$ using your computer. However, you can press each key $0$–$9$ at most $n$ times during the process.

What is the last number you can write?

The only input line contains the value of $n$.

Print the last number you can write.

- $1 \le n \le 10^{18}$

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 $13$.