The input contains between 1 and 10 lines, *i*-th line contains an integer number *x*<sub class="lower-index">*i*</sub> (0 ≤ *x*<sub class="lower-index">*i*</sub> ≤ 9).
t = int(input())
p, q = 0, 0
for i in range(t):
    d = int(input())
    p += d
    q += 1
print(p / q)