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.*;
import java.math.*;
import java.lang.*;

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 count = 0;

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

    System.out.println(count);

  }

}
