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