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: Wrong Answer)

using System;
using System.Linq;

class A
{
	static void Main()
	{
		string[] x = (Console.ReadLine()).Split(' ');
		int a = int.Parse(x[1]) / int.Parse(x[2]);
        int b = int.Parse(x[0]) / int.Parse(x[2]);
        if(int.Parse(x[1])%int.Parse(x[2])!=0 && int.Parse(x[0])%int.Parse(x[2])!=0)
        {
        Console.WriteLine(
            (a-b).ToString()
        );
        }
        else
        {
                    Console.WriteLine(
            (a-b+1).ToString()
        );
        }
	}
}