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.*;

class Main {
  static Scanner sc = new Scanner(System.in);

  public static void main(String[] args) {
    int l = sc.nextInt();
    int r = sc.nextInt();
    int d = sc.nextInt();
    int a;
    int count = 0;
    for (int i = 0; i < r + 1; i++) {
      a = d * i;
      if (a >= l && a <= r) {
        count = count + 1;
      }
    }
    System.out.println(count);
  }
}