using System;

​

public class Program

{

    public static void Main()

    {

        int i, n, sum = 0;

        Console.Write("\n\n");

        Console.Write("Display the sum of n odd natural number:\n");

        Console.Write("------------------------------------------");

        Console.Write("\n\n");

        Console.Write("Input number of terms : ");

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

        Console.Write("\nThe odd numbers are :");

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

        {

            Console.Write("{0} ", 2 * i - 1);

            sum += 2 * i - 1;

        }

​

        Console.Write("\nThe Sum of odd Natural Number upto {0} terms : {1} \n", n, sum);

    }

}