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;
using System.Text.RegularExpressions;

namespace Atcoder2
{
    class Program
    {

        public static void Main(string[] args)
        {
            string[] tmpStr = Console.ReadLine().Split(' ');
            int min = int.Parse(tmpStr[0]);
            int max = int.Parse(tmpStr[1]);
            int num = int.Parse(tmpStr[2]);
            int count = 0;
            for(int i = min; i <= max; i++)
            {
                if (i % num == 0)
                {
                    count += 1;
                }
            }

            Console.WriteLine(count);
        }
    }
}