import java.io.*;
class prbwhile3 
{
	public static void main(String Arg[ ]) throws IOException
	{
		double media = 0.0;
		int n = 0;
		int elementos; 
		double num;
         
		BufferedReader in = new BufferedReader(new 
			InputStreamReader(System.in));

		System.out.print("Ingrese numero de elementos a ingresar : ");
		elementos = Integer.parseInt(in.readLine( ));

		while (n < elementos)
		{
			System.out.print("\nIngrese numero : ");
			num = Double.parseDouble(in.readLine( ));
           	
			media = (media * n + num) / (double) (n + 1);
            
			/* Redondea a dos decimales */
            
			media = Math.round(media * 100.0) / 100.0;
           
			System.out.println("media actual : " + media);
            
			n++;
		}
       
		System.out.println("\nMedia final : " + media );
	}
}