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# (.NET Core 3.1.201) (judge verdict: Accepted)

using System.Linq;
using static System.Console;

public static class Program
{
    public static void Main()
    {
        var line = ReadLine().Split(' ').Select(int.Parse).ToArray();
        var l = line[0];
        var r = line[1];
        var d = line[2];
        int count = 0;
        for(int i = l; i <= r; ++i)
        {
            if (i % d == 0) ++count;
        }
        WriteLine(count);
    }
}