Average Speed Calculation

You are given a list of non-negative speeds (in km/h). Your task is to compute the average speed rounded to two decimal places. The average is defined by the formula:

\(\text{Average} = \frac{\text{sum of speeds}}{\text{number of speeds}}\)

If the list of speeds is empty, simply output 0. Otherwise, compute the average and round it as follows:

• If the result is a whole number or has one significant decimal digit (e.g. 30.0 or 13.5), output it with one decimal place.
• If it has two non-zero decimal digits, output it with two decimal places.

Note: The input is provided via standard input and the result must be printed to standard output.

inputFormat

The first line contains an integer n representing the number of speeds. If n > 0, the second line contains n space-separated floating point numbers representing the speeds (in km/h). If n is 0, there will be no speeds on the next line.

outputFormat

Print the average speed according to the rules described above. If the list is empty, print 0. Otherwise, print the average speed rounded to one or two decimal places based on the value.

5
20 25 30 35 40

30.0