Description

Xiao Ming has graduated for a year and found a good job. He has earned a lot of money this year, and now he wants to know his average monthly salary over the past year. Please write a program to help him calculate it.

Input Format

The input consists of 12 lines. The i-th line represents the actual monthly salary for the i-th month (i=1,2,3...).

Output Format

Output Xiao Ming's average monthly salary, rounded to two decimal places.

100.00 
489.12 
12454.12 
1234.10 
823.05 
109.20 
5.27 
1542.25 
839.18 
83.99 
1295.01 
1.75

1581.42

译文

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