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# (Mono-mcs 6.8.0.105) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

class Program
{
    static void Main(string[] args)
    {
        string[] LRd = Console.ReadLine().Split(' ');
        int[] vs = new int[3];
        int count = 0;
        for (int i = 0; i < 3; i++)
        {
            vs[i] = Convert.ToInt32(LRd[i]);
        }

        for (int i = vs[0]; i <= vs[1]; i++)
        {
            if ((i % vs[2]) == 0)
            {
                count++;
            }
        }

        
        Console.WriteLine(count);

    }
}