Average Salary

A company employs a number of employees, but not less than two: the director and the chief accountant. We also know that the number of employees does not exceed 1000. The task is to determine the average salary in the enterprise by knowing salary of every employee.

Input

Wages of employees (not necessarily in one line) in national currency.

Output

Average salary in the enterprise in UAH to within 2 digits after the decimal point.

Examples