Maximum of absolute values#914

Maximum of absolute values

1 second
128 megabytes
Very easy

A sequence of real numbers is given. Compute the absolute values of these numbers. Find the maximum among these absolute values.

Input

The first line contains the number of elements (n \le 100) in the sequence. The second line contains real numbers — the elements of the sequence, each with absolute value not exceeding .

Output

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

Examples

Example 1

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Example 2

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