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 {
	 public static void main(String args[]){
	Scanner scanner = new Scanner(System.in);
		int l=scanner.nextInt();
       int r=scanner.nextInt();
       int d=scanner.nextInt();
       int total=0;

	// 変数strの長さ分回す
	for (int i = l; i <=r; i++) {
	   if(i%d==0){
       total=total+1;
       }

	}
	System.out.println(total);}
}
