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