n = int(input())
m = list(range(n))
sum = 0
for i in range(int(n)):
m[i] = int(input())
maximum = max(m)
for i in range(int(n)):
m[i] = m[i] / maximum * 100
for i in range(int(n)):
sum = sum + m[i]
print(sum/n)
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