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.util.function.*;
import java.math.*;
public class Main {
    public static void main(String[] args){
		Scanner s = new Scanner(System.in);
		int L = Integer.valueOf(s.next());
		int R = Integer.valueOf(s.next());
		int d = Integer.valueOf(s.next());
		
		int ret = 0;
		for(int i = L; i <=R; i++) {
			if(i % d == 0) {
				ret++;
			}
		}
		
		System.out.println(ret);
	}
}