The arithmetic mean of positive

The sequence of real numbers is given. Find the arithmetic mean of positive numbers.

Input

First line contains amount n (0 < n ≤ 100) of real numbers. Next line contains n real numbers, each of them is not greater than 100 by absolute value.

Output

Print the arithmetic mean of positive numbers with 2 digits after decimal point. If the positive numbers do not appear in the sequence, print "Not Found" (without quotes).

Examples