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
#include <stdio.h>
int main(){
int l,r,d;
scanf("%d %d %d",&l,&r,&d);
printf("%d",(r/d*d-(l+d-1)/d*d)/d+1);
puts("");
return 0;
}
