e-olymp
Problems

Maximum of absolute values

Maximum of absolute values

The sequence of real numbers is given. Lets find their absolute values. Find the maximum value among these absolute values.

Input

First line contains the number n (n100) of elements in the sequence. Next line gives n real numbers - the elements of the sequence, which values do not exceed 100 by absolute value.

Output

Print the maximum value among the absolute values of given numbers with 2 digits after the decimal point.

Time limit 1 seconds
Memory limit 128 MiB
Input example #1
5
6 7.5 2.1 2.0 0

Output example #1
7.50
Input example #2
4
-76.45 7.5 -5.1 75.23

Output example #2
76.45
Source SFE-2010 Variant 14