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;

// Aising2020_A
public 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 i = 0;
		int count = 0;

		while (true) {
			if (d * i > R) {
				break;
			}
			if (L <= d * i && d * i <= R) {
				count++;
			}
			i++;
		}

		System.out.println(count);
		sc.close();
	}

}
