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.math.*;
import java.util.*;

public class Main {

    Scanner sc = new Scanner(System.in);

    public static void main(String[] args) {
        new Main().run();
    }

    void run() {

        int l = sc.nextInt();
        int r = sc.nextInt();
        int d = sc.nextInt();

        int cnt = 0;

        for (int i=l; i<=r; i++) {
            if (i % d == 0) cnt++;
        }

        System.out.print(cnt);

    }


}

