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 { //クラス名はMain
    public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
      int L = in.nextInt();
      int R = in.nextInt();
      int d = in.nextInt();
      int r = R / d;
      int l = L /d ;
      if(L%d == 0 ){
      System.out.print(r-l+1);
      }
      else{
      System.out.print(r-l);
      }
      }
}