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.*;
import java.io.*;
public class Main{
	public static void main(String[] args) throws IOException{
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
		String[] lo =reader.readLine().split(" ");
		int L = Integer.parseInt(lo[0]);
		int R = Integer.parseInt(lo[1]);
		int d = Integer.parseInt(lo[2]);
		int a = (L-1)/d;
		int b = (R)/d;
		System.out.println((b-a));
	}
}
