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Expand Up @@ -12,15 +12,21 @@ The **digit sum** of a positive integer is the sum of all its digits.

**Output:** 2

**Explanation:** The only integers less than or equal to 4 whose digit sums are even are 2 and 4.
**Explanation:**

The only integers less than or equal to 4 whose digit sums are even are 2 and 4.

**Example 2:**

**Input:** num = 30

**Output:** 14

**Explanation:** The 14 integers less than or equal to 30 whose digit sums are even are 2, 4, 6, 8, 11, 13, 15, 17, 19, 20, 22, 24, 26, and 28.
**Explanation:**

The 14 integers less than or equal to 30 whose digit sums are even are

2, 4, 6, 8, 11, 13, 15, 17, 19, 20, 22, 24, 26, and 28.

**Constraints:**

Expand Down