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.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner scanner = new Scanner(System.in);
		int l =scanner.nextInt();
		int r =scanner.nextInt();
		int d =scanner.nextInt();
		int count=0;

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

		System.out.println(count);
		scanner.close();

	}

}
