Competitions

# 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 < n100) 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).

Time limit 1 second
Memory limit 128 MiB
Input example #1
3
5.2 -2 4

Output example #1
4.60

Input example #2
3
-5.2 -2 -4

Output example #2
Not Found

Source SFE-2010 Variant 10