using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("");

        Console.Write("Masukkan nilai n: ");

            int n = int.Parse(Console.ReadLine());

​

            int jumlah = 0;

            Console.Write(n +  "bilangan:");

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

            {

                Console.Write(i);

                jumlah += i;

            }

            Console.WriteLine("\nJumlah Bilangan Asli sampai " + n + " suku: " + jumlah);

    }

}