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.*;
class Main
{
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		String aa[]=sc.nextLine().split(" ");
		int a=Integer.parseInt(aa[0]);
		int b=Integer.parseInt(aa[1]);
		int v=Integer.parseInt(aa[2]);

		System.out.println(b/v-a/v+(a%v==0?1:0));
	}
}