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.*;
 
class Main {
  public static void main (String[] args) {
    Scanner sc = new Scanner (System.in);
    int l = Integer.parseInt(sc.next());
    int r = Integer.parseInt(sc.next());
    int d = Integer.parseInt(sc.next());
    sc.close();
    
    System.out.println( r/d - (l-1)/d );
  }
}