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;
class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      	int L = sc.nextInt();
      	int R = sc.nextInt();
      	int d = sc.nextInt();
      	int a = R-L;
      	int g = a/d;
      if(L%d != 0 && R%d !=0){
      	System.out.println(g);
      }else{
      	System.out.println(g+1);
      }
    }
}