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).
numbers = []
for _ in range(int(input())):
	numbers.append(int(input()))
print(sum(numbers)/len(numbers))