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<cstdio>
int main(){
	int l,r,d;
	int s=0;
	scanf("%d%d%d",&l,&r,&d);
	for(int i=l;i<=r;i++){
		if(i%d==0) s=s+1;
		
	}
	printf("%d",s);
} 