using System;

public class Program

{

    public static void Main()

    {

        int x,a,n;

        double b;

        Console.Write("Nhập n= ");

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

        a = 0;

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

            a=a+x;

        b = 1.0 * a/n;

        Console.WriteLine("Sum= {0}, Agv= {1} ",a,b);

    }

}