Section 11,6: AMAX0

 AMAX0 (number, number, ...)

 A function that returns the greatest of the values specified in the
 argument list.  There must be at least two arguments.

 +------+---------+----------+------------+-------------+        
 | Args | Generic | Specific |  Argument  | Result Type |
 +------+---------+----------+------------+-------------+
 |   n  | AMAX0   |   --     | INTEGER*1  | REAL*4      |
 |      |         | AIMAX0   | INTEGER*2  | REAL*4      |
 |      |         | AJMAX0   | INTEGER*4  | REAL*4      |
 |      |see note | AKMAX0   | INTEGER*8  | REAL*4      |
 +------+---------+----------+------------+-------------+

 NOTE: AKMAX0 is only available on AXP systems.
 See also the MAX intrinsic function.