using System;  

public class Exercise3  

{  

    public static void Main() 

{

   int i,n,sum=0;

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

    Console.Write("Display n terms of natural number and their sum:\n");

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

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

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

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

   Console.Write("\nThe first {0} natural number are :\n",n);

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

   {

     Console.Write("{0} ",i);

     sum+=i;

   }

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

    Console.WriteLine("\nBy Jaciel Alberto Zapata Saenz");

  }

}

​