Count Multiples

Given three integers A, B, and K, your task is to calculate the number of multiples of K in the closed interval [A, B]. In other words, find the count of integers x such that A ≤ x ≤ B and K divides x evenly.

You can use the formula: \(\lfloor \frac{B}{K} \rfloor - \lfloor \frac{A-1}{K} \rfloor\) to compute the answer, but you are free to use any correct approach.

For example:

• Input: 6 11 2 → Multiples: 6, 8, 10 so output is 3.
• Input: 1 10 3 → Multiples: 3, 6, 9 so output is 3.

inputFormat

Standard input consists of a single line containing three space-separated integers A, B, and K.

outputFormat

Output a single integer -- the number of multiples of K between A and B (inclusive).

6 11 2

3