using System;

public class Program

{

    public static void Main()

    {

        int i;

        int sum = 0;

        int n = 100;

        for (i = 1; i < n; i++) 

        {

            sum += i;

            Console.WriteLine("The current index i is: " + i);

        }

        Console.WriteLine(i);

        Console.WriteLine("Sum of first {0} is {1}", n, sum);

    }

}