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;
import java.util.stream.Stream;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] line = Stream.of(sc.nextLine().split(" ", 0)).mapToInt(Integer::parseInt).toArray();
		int ans = 0;
		for (int i = line[0]; i <= line[1]; i++) {
			if (i % line[2] == 0) {
				ans++;
			}
		}
		System.out.println(ans);
	}
}