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<bits/stdc++.h>
using namespace std;
int main()
{
	int l,r,x,ans=0,i;
	cin>>l>>r>>x;
	for(i=l;i<=r;i++)
	{
		if(i%x==0)ans++;
	 } 
    cout<<ans;
} 