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(), R = sc.nextInt(),d = sc.nextInt();
    int count = 0;
    for (int num=L; num<=R; num++) {
      count += (num%d == 0)?1 : 0;
    }
    System.out.println(count);
  }
}