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 keyboard = new Scanner(System.in); 
		
		int L= keyboard.nextInt();
		long D = keyboard.nextInt();
		long d = keyboard.nextInt();
		
		long ans = 0;
		
		for(int i = L; i<D+1; i++) {
			if(i%d == 0) {
				ans++;
			}
		}
		
		System.out.print(ans);
		keyboard.close();	
		
	}
}