题号：NC216039
时间限制：C/C++/Rust/Pascal 1秒，其他语言2秒
空间限制：C/C++/Rust/Pascal 256 M，其他语言512 M
64bit IO Format: %lld
时间限制：C/C++/Rust/Pascal 1秒，其他语言2秒
空间限制：C/C++/Rust/Pascal 256 M，其他语言512 M
64bit IO Format: %lld
题目描述
2020 is a special integer, it's formed of two same integers (20 and 20).
We call a number is a good number, if and only if it can be formed of two same integers(without leading zero).
For example: 2020 11, 19991999 are good numbers, but 303, 1122, 1221 are not.
Now you need to count the number of good numbers in
We call a number is a good number, if and only if it can be formed of two same integers(without leading zero).
For example: 2020 11, 19991999 are good numbers, but 303, 1122, 1221 are not.
Now you need to count the number of good numbers in
输入描述:
The first line has one single integer
输出描述:
Output the answer