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.*;
import java.io.*;
public class Main{
    public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		PrintWriter ou = new PrintWriter(System.out);
		int l = Integer.parseInt(sc.next());
		int r = Integer.parseInt(sc.next());
		int d = Integer.parseInt(sc.next());
		sc.close();
		int yono = 0;
		for(int i = l ; i <= r ; i++) if(i % d == 0) yono++;
		ou.print(yono + "\n");
		ou.flush();
    }
}