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.Locale;
import java.util.Scanner;

public class Main {
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in).useLocale(Locale.US);
        int l = sc.nextInt(), r = sc.nextInt(), d = sc.nextInt();

        if(l % d != 0) l += (d - l % d);
        if(r % d != 0) r -= r % d;

        System.out.println((r - l) / d + 1);
    }
}
