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