Problem:
Score : 100 points

Problem Statement

How many multiples of d are there among the integers between L and R (inclusive)?

Constraints

All values in input are integers.

1 \leq L \leq R \leq 100

1 \leq d \leq 100

Input

Input is given from Standard Input in the following format:

L R d

Output

Print the number of multiples of d among the integers between L and R (inclusive).

Sample Input 1

5 10 2

Sample Output 1

3

Among the integers between 5 and 10, there are three multiples of 2: 6, 8, and 10.

Sample Input 2

6 20 7

Sample Output 2

2

Among the integers between 6 and 20, there are two multiples of 7: 7 and 14.

Sample Input 3

1 100 1

Sample Output 3

100

Solution in JavaScript (Node.js 12.16.1) (judge verdict: Accepted)

(async () => {
  process.stdin.setEncoding('utf8');
  let text = '';
  for await (const chunk of process.stdin) text += chunk;

  const lines = text.toString().split('\n');
  const tmpArray = lines[0].split(' ');
  const start = parseInt(tmpArray[0], 10);
  const end = parseInt(tmpArray[1], 10);
  const num = parseInt(tmpArray[2], 10);
  const target = new Array(end - start + 1).fill(null).map((_, i) => i + start)

  const result = target.filter(v => v % num === 0);
  console.log(result.length);
})();