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).
foo = bar = 0
quz = 1
for bar in range(int(input())):
    foo += int(input())
    if foo * quz < baz * bar: break
    baz, quz = foo, bar
print(baz / quz)