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 scanner = new Scanner(System.in);
    int l = scanner.nextInt();
    int r = scanner.nextInt();
    int d = scanner.nextInt();
    int ans = 0;

    for(int i = l; i <= r; i++){
      if(i % d ==0){
        ans++;
      }
    }
    


    System.out.println(ans);
    
    scanner.close();
    return;
  }
  
}
