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.Collections.Generic;
using System.Text;

class Program
{
	static void Main(string[] args)
	{
		string[] input = Read();
		int l = int.Parse(input[0]);
		int r = int.Parse(input[1]);
		int d = int.Parse(input[2]);

		int ld = l/d;
		int rd = (r-1)/d;
		Write(ld-rd);
	}

	static string[] Read()
	{
		return Console.ReadLine().Split(' ');
	}

	static void Write(object o)
	{
		Console.WriteLine(o.ToString());
	}
}