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 s=new Scanner(System.in);
    int n,l,r,res=0;
    
    l=s.nextInt();
    r=s.nextInt();
    n=s.nextInt();
    for(int i=l;i<=r;i++)
    {
      if(i%n==0)
      {
        res++;
      }
    }
    System.out.println(res);
  }
}
      
      