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 sc = new Scanner(System.in);
	int L = sc.nextInt();
	int R = sc.nextInt();
	int d = sc.nextInt();
	if (L%d == 0 && R%d == 0) {
	    System.out.print(R/d - L/d + 1);
	} else {
	    System.out.print(R/d - L/d);
	}
    }
}

