package com.scalefocus;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int workDays = Integer.parseInt(sc.nextLine());
        int [] workHoursPerDay = new int[workDays];
        workHoursEntry(workHoursPerDay, sc);
        double averageWorkHours = calculateAverageHours(workHoursPerDay,workDays);
        System.out.printf( "%.2f%n" , averageWorkHours);
        for (int i = 0; i < workHoursPerDay.length ; i++) {
            if (workHoursPerDay[i] > averageWorkHours) {
                System.out.println(i);
            }
        }

    }

    private static double calculateAverageHours(int[] workHoursPerDay, int workDays) {
        int sum = 0;
        double result = 0.0;
        for (int i = 0; i < workHoursPerDay.length ; i++) {
            sum += workHoursPerDay[i];
        }
        result = (double) sum / (double) workDays;
        return result;
    }

    private static int[] workHoursEntry(int[] workHoursPerDay, Scanner sc) {
        for (int i = 0; i < workHoursPerDay.length ; i++) {
            workHoursPerDay[i] = Integer.parseInt(sc.nextLine());
        }
        return workHoursPerDay;
    }
}