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();
    
    int index;
    int cnt = 0;
    
    for(index = l; index % d != 0; index++){};
    
    for(int i = index; i <= r; i += d){
      cnt++;
    }
    
    System.out.println(cnt);
  }
}