import java.util.Scanner;

public class SrednoAr {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.nextLine());
        int[] numbers = new int[n];
        if (n >= 0 && n <= 31) {
            InputNumbers(numbers, sc);
            AverageSum(numbers);
        }
    }

    private static void AverageSum(int[] numbers) {
        double sum = 0;
        double averageSum = 0;
        for (int i = 0; i < numbers.length; i++) {
            sum += numbers[i];
            averageSum = sum / numbers.length;
            if (averageSum < numbers[i]) {
                    System.out.printf("%d%n", i);
            }
        }
        System.out.printf("%.2f ", averageSum);
    }

    private static void InputNumbers(int[] numbers, Scanner sc) {
        for (int index = 0; index < numbers.length; index++) {
            numbers[index] = Integer.parseInt(sc.nextLine());
        }

    }

}