9734: ABC195 —— C - Comma
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Description
When Takahashi writes an integer, he uses a comma every third digit from the right. For example, $1234567$ is written as `1,234,567`, and $777$ is written as `777`.
How many commas will be used in total when he writes each integer from $1$ through $N$ once?
How many commas will be used in total when he writes each integer from $1$ through $N$ once?
Input
Input is given from Standard Input in the following format:
```
$N$
```
```
$N$
```
Output
Print the total number of commas.
Constraints
- $1 \leq N \leq 10^{15}$
- $N$ is an integer.
- $N$ is an integer.
Sample 1 Input
1010
Sample 1 Output
11
No comma is used in writing 999 or smaller numbers. One comma is used in writing each of the numbers from 1000 through 1010.
Thus, 11 commas are used in total.
Thus, 11 commas are used in total.
Sample 2 Input
27182818284590
Sample 2 Output
107730272137364