Given integers, compute their average, rounded to three decimal places.

Input Format
The first line contains an integer, .
Each of the following lines contains a single integer.

Output Format
Display the average of the integers, rounded off to three decimal places.

Input Constraints

( refers to elements of the list of integers for which the average is to be computed)

Sample Input

4
1
2
9
8

Sample Output

5.000

Explanation
The '4' in the first line indicates that there are four integers whose average is to be computed.

The average = (1 + 2 + 9 + 8)/4 = 20/4 = 5.000 (correct to three decimal places).

Please include the zeroes even if they are redundant (e.g. 0.000 instead of 0).