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 s = new Scanner(System.in);

		 int l = s.nextInt();
		 int r = s.nextInt();
		 int d = s.nextInt();

		 int result = 0;

		 for(int i = l; i <= r; i++) {
			 if(i % d == 0) {
				 result++;
			 }
		 }

		 System.out.println(result);
	}

}