Given a positive integer num, return the count of positive integers less than or equal to num whose sum of digits is an even number.

The digit sum of a positive integer is defined as the sum of all its individual digits.

Constraints:

• $1 \leq$ num $\leq 1000$

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.