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 ret = 0;
    int multiply = d;
    while (true) {
      if (multiply > r) {
        break;
      } else if (multiply >= l && multiply <= r) {
        ret++;
      }
      multiply += d;
    }
    System.out.println(ret);
  }
}
