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 \textbf{1000}. The task is to determine the average salary in the enterprise by knowing salary of every employee. \InputFile Wages of employees (not necessarily in one line) in national currency. \OutputFile Average salary in the enterprise in UAH to within \textbf{2} digits after the decimal point.