package com.company;
import java.util.*;
public class Main {

    public static void inputHoursPerDay (int daysArr[], int n, Scanner input) {

        for(int i=0; i< daysArr.length; ) {
            daysArr[i] = Integer.parseInt(input.nextLine());
            if(daysArr[i] >= 0)  i++;
        }
    }

    public static double arithmeticMean(int daysArr[]) {
        double mean = 0.0;
        int sum = 0;
        for(int i=0; i<daysArr.length; i++) {
            sum += daysArr[i];
        }
        mean = (double) sum/(daysArr.length);
        return mean;
    }

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int n;
        do {
            n = Integer.parseInt(input.nextLine());
        } while(n>=31 || n<0);
        int[] hours = new int[n];
        inputHoursPerDay(hours, n, input);
        double averagePerDay = arithmeticMean(hours);
        System.out.printf("%.2f",averagePerDay);
        System.out.println();
        for(int i = 0; i<hours.length; i++) {
            if(hours[i] > averagePerDay) System.out.println(i);
        }

    }
}