（悲）

# Language: 蟒蛇的母语
cnt = 0
a = []
n = input()

for i in range(0, int(n)):
    x = input()
    a.append(int(x))
    cnt += int(x)

print(cnt/int(n))

$\color{blue}{运行错误}\color{black}{（恼）}$