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.Scanner;

public class Main {

  public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    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.println(cnt);

  }
}