Description

Given a set of sample data containing n floating-point numbers, calculate the mean value, accurate to 4 decimal places.

Input Format

The input consists of two lines:

• The first line contains an integer n (n < 100), representing the sample size.
• The second line contains n floating-point numbers with absolute values not exceeding 1000, representing the individual sample data points.

Output Format

Output a single line containing a floating-point number, representing the mean value, accurate to 4 decimal places.

2
1.0 3.0

2.0000