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.* ;
public class Main {
    public static void main(String[] args) {
        Main obj = new Main() ;
        Scanner S = new Scanner( System.in ) ;
        int l = S.nextInt() ;
        int r = S.nextInt() ;
        int k = S.nextInt() ;
        int result = 0 ;
        for( int i=l;i<=r;i++ ) {
            if( i%k==0 ) result++ ;
        }
        System.out.println( result ) ;
    }
}