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 {
	
	private static Scanner sc;
	
	public static void main (String args[]) {
		sc = new Scanner(System.in);
		int lNum = Integer.parseInt(sc.next());
		int rNum = Integer.parseInt(sc.next());
		int dNum = Integer.parseInt(sc.next());
		int resultNum = 0;
		for(int i = lNum; i<=rNum; i++) {
			int def = i%dNum;
			if(def==0) {
				resultNum++;
			}
		}
		System.out.println(resultNum);		
	}	
}