Your teacher has assigned you the task of finding out the average weight of your class. She gives you the weights of all the students in the class and expects you to calculate the average weight of the class. Assume that there are only 10 students in your class.

Input Format

A single line with 10 space separated weights

w₁ w₂ w₃ w₄ w₅ w₆ w₇ w₈ w₉ w₁₀

Output Format

A single value - The average weight

The value should be accurate upto exactly 6 decimal places.

Examples

Sample Input

40.75 45.2 55.3 49.5 43.3 54.1 38.4 63.8 45.2 58.25

Expected Output

49.380000

Constraints

Weights can be decimal values.

0 <= wi <= 150