KHR416

import sys
my_input = sys.stdin.readline

def	main():
	N = int(my_input())
	M = int(my_input())
	L = [0 for _ in range(M + 1)]
	for x in my_input().split():
		if int(x) <= M:
			L[int(x)] = 1

KHR416

import sys
my_input = sys.stdin.readline

def	main():
	list_len, nline = [int(x) for x in my_input().split()]
	nbr_list = [[int(col) for col in my_input().split()] for row in range(list_len)]
	ps_list = [[0 for col in range(list_len + 1)] for row in range(list_len + 1)]
	for row in range(list_len):
		for col in range(list_len):
			ps_list[row + 1][col + 1] = nbr_list[row][col] + ps_list[row + 1][col] + ps_list[row][col + 1] - ps_list[row][col]

KHR416

import sys
my_input = sys.stdin.readline

def	main():
	list_len, nline = [int(x) for x in my_input().split()]
	nbr_list = [int(nbr) for nbr in my_input().split()]
	partial_sum_list = [0 for _ in range(list_len + 1)]
	for i in range(list_len):
		partial_sum_list[i + 1] = partial_sum_list[i] + nbr_list[i]
	for _ in range(nline):

KHR416

def	main():
	list_len = int(input())
	score_list = [int(score) for score in input().split()]
	print(sum(score_list) / max(score_list) / list_len * 100)

if __name__ == "__main__":
	main()

KHR416

def	main():
	input()
	print(sum([int(digit) for digit in input()]))

if __name__ == "__main__":
	main()