1546

## 🔒 문제 002. 평균 구하기 #1546
n = int(input())
score_lst = list(input().split())
score_lst = [int(i) for i in score_lst]

score_max = int(max(score_lst))
score_lst_new = []

for i in range (1, n+1):
  score_lst_new.append(score_lst[i-1] / score_max * 100)
  avg = sum(score_lst_new) / len(score_lst_new)

print(avg)


''' 모범 답안
n = input()
mylist = list(map(int, input().split()))
mymax = max(mylist)
sum = sum(mylist)

print(sum * / mymax / int(n))
'''