using System;

public class Program

{

    public static void Main()

    {

        int n = 0;

​

        Console.WriteLine("Enter the integer value: ");

​

        n = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("The sum of all the integer values from 0 to {0} is: {1}", n, calculateSum(n));

    }

​

    public static int calculateSum(int n)

    {

        int totalSum = n;

        for(int i=1; i>n; i--)

        totalSum += i;

        return (totalSum);

    }

}