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;
	scanf("%d%d%d", &l, &r, &d);

	printf("%d\n",  l % d == 0 ? r / d - l / d + 1: r / d - l / d);

	return 0;
}
