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 = Integer.parseInt(sc.next());
		int R = Integer.parseInt(sc.next());
		int d = Integer.parseInt(sc.next());
		int count = 0;

		for(int i=L;i<=R;i++) {
			if(i%d==0)count++;
		}
		System.out.println(count);

	}
}