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).

Examples

Input

5 10 2


Output

3


Input

6 20 7


Output

2


Input

1 100 1


Output

100
import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        int l = scan.nextInt();
        int r = scan.nextInt();
        int d = scan.nextInt();
        if(l % d == 0 || r % d == 0) System.out.println((r - l) / d + 1);
        else System.out.println((r - l) / d);
        scan.close();
    }
}
