Average of Positive Numbers

You are given a list of integers. Your task is to calculate the average of all positive numbers in the list. If there are no positive numbers, the answer should be 0.

More formally, if the list contains positive numbers \(p_1, p_2, \dots, p_k\), you are to compute:

\(\frac{p_1+p_2+\cdots+p_k}{k}\)

If \(k=0\) (i.e. there are no positive numbers), output 0.

inputFormat

The input is read from stdin and consists of two lines:

• The first line contains a single integer \(n\), representing the number of elements in the list.
• The second line contains \(n\) space-separated integers.

outputFormat

Output the average of the positive numbers as a floating-point number in stdout. If there are no positive numbers, output 0.

4
1 -2 3 4

2.6666666666666665