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.*;
public class Main {
	public static void main(String[] args) {
		Scanner in=new Scanner(System.in);
		while(in.hasNext()) {
			int L=in.nextInt();
			int R=in.nextInt();
			int d=in.nextInt();
			int count=0;
			for(int i=L;i<=R;i++) {
				if(i%d==0) {
					count++;
				}
			}
			System.out.println(count);
		}
	}
}
