using System;

public class Program

{

    public static void Main()

    {

        int cislo = 0;

        int pocetcisel = 0;

        int soucetcisel = 0;

        int prumer = 0;

        zacatek:

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

        if(cislo==0){ goto konec;}

        soucetcisel = soucetcisel + cislo;

        pocetcisel++;

        goto zacatek;

        konec:

        prumer = soucetcisel / pocetcisel;

        Console.WriteLine("Průměr čísel je: "+prumer)

;       

    }

}