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 s=new Scanner(System.in);
    int L=s.nextInt();
    int R=s.nextInt();
    int d=s.nextInt();
    int ans=0;
    for(int i=L;i<=R;i++){
      if(i%d==0) ans+=1;
    }
    System.out.println(ans);

  }  
}