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;
import java.util.Arrays;

public class Main{
public static void main(String[] args){
Scanner scan=new Scanner(System.in);
int l=scan.nextInt();
int r=scan.nextInt();
int d=scan.nextInt();

int i=0;
int sum=0;
for(i=l;i<r+1;i++){
    if(i%d==0){
        sum=sum+1;
    }
}

System.out.println(sum);


}
}