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.io.*;
import java.util.Scanner;
 
public class Main{
  public static void main(String[] args)throws IOException{
       Scanner scan=new Scanner(System.in);
        int l,r,d;
        int count=0;
        
       
        l=scan.nextInt();
       
        r=scan.nextInt();
      
        d=scan.nextInt();
       
    
      for(int i=l;i<=r;i++){
        if(i%d==0)
         count++;
        
          }
    System.out.println(count);
  
  }
}