Maximum Salary

Small business operates oprelennoe number of employees, but not less than two - the director and chief accountant. Knowing the salary of all employees, to determine the highest salary in the enterprise.

Input

In a single line through the gap given the wages of workers in national currency. All input data - non-negative real numbers, separated by spaces, their number does not exceed 1000.

Output

The only number - the answer to the problem, derived from two digits after the decimal point.

Examples