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 s = new Scanner(System.in);
	int L = s.nextInt();
	int R = s.nextInt();
	int d = s.nextInt();
	int count = 0;
	for(int i = L; i <= R; i++){
		if(i%d==0) count++;
	}

	System.out.println(count);
    
  }
}