import java.util.*;

class Moyenne {

    static final Scanner input = new Scanner(System.in);

    public static void main(String[] args) {
        int n;
        double somme;
        double moyenne;

        System.out.print("n ? ");
        n = input.nextInt();

        System.out.println("Entrer " + n + " " +
                           (n > 1 ? "valeurs" : "valeur") + " :");
        somme = 0.0;
        for (int i = 0; i < n; ++i) {
            somme += input.nextDouble();;
        }
        moyenne = somme / n;

        System.out.println("somme = " + somme);
        System.out.println("moyenne = " + moyenne);
    }
}