using System;

public class Program

{

    public static void Main()

    {

    //Write a program that read a number that represents

        //the max value of a sum operations.

        //the program should print and add(sum) a number from 1 to N

        //while sum<num

        Console.Clear();

        Console.WriteLine("introuduce max value: ");

        int num = Convert.ToInt32(Console.ReadLine());  //max value 

        int sum = 0; //Variabe to store the sum

        int n = 1;  //Number to print and add

​

        do

        {

            sum += n;       //add the value of n to sum

            Console.Write("{0} ", n);   //print the current value of n 

            n++;                        //increment n by 1

        }   while (sum < num); //while the sum < max value

        Console.WriteLine("\nThe sum is = {0}", sum);   //print the result

    }

}