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.*;
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();
        if(L%d==0){
            System.out.println(R/d-L/d+1);
        }else{
            System.out.println(R/d-L/d);
        }
    }
}