Problem:
Score : 100 points

Problem Statement

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).

Sample Input 1

5 10 2

Sample Output 1

3

Among the integers between 5 and 10, there are three multiples of 2: 6, 8, and 10.

Sample Input 2

6 20 7

Sample Output 2

2

Among the integers between 6 and 20, there are two multiples of 7: 7 and 14.

Sample Input 3

1 100 1

Sample Output 3

100

Solution in C++ (GCC 9.2.1) (judge verdict: Accepted)

#include<bits/stdc++.h>
using namespace std;
#define pb          push_back
#define vi          vector<int>
#define all(a)      (a).begin(),(a).end()
#define F           first
#define S           second
#define endl        "\n"
#define fast        ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#define int         long long int
#define mod         1000000007
#define test        int t;cin>>t;while(t--)
#define REP(i,a,b)  for(int i=a,i<=b;i++)
#define MAXN        200001

int32_t main()
{
	
	int l,r,d;
	cin>>l>>r>>d;

	int cnt=0;
	for(int i=l;i<=r;i++){
		if(i%d==0)
			cnt++;
	}

	cout<<cnt<<endl;
	return 0;
}