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.Scanner;
 
public class Main {
  public static void main(String[] args ) {
    Scanner sc = new Scanner(System.in);
     int start=sc.nextInt();
     int end = sc.nextInt();
     int devide=sc.nextInt();
     int j = 0;
     for(int i=start;i<=end;i++){
       if(i%devide==0){
         j=j+1; 
       }
     }
     System.out.println(j);
  }
}