Given an integer n, return the total number of commas used when writing every integer from $1$ to n inclusive in standard decimal notation with digit grouping.

In standard decimal notation, commas are placed between digits to group them in sets of three, starting from the right.

Constraints:

• $1 \le$ n $\le 10^5$

Now, let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:

We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Implement your solution in the following coding playground.