VMS Help FORTRAN, Intrinsic Procedures, MAX  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  MAX (number, number, ...)

  A function that returns the greatest of the values specified in the
  argument list.
  +------+---------+----------+------------+-------------+
  | Args | Generic | Specific |  Argument  | Result Type |
  +------+---------+----------+------------+-------------+
  |  n   |  MAX    | IMAX0    | INTEGER*2  | INTEGER*2   |
  |      |         | JMAX0    | INTEGER*4  | INTEGER*4   |
  |      |         | AMAX1    | REAL*4     | REAL*4      |
  |      |         | DMAX1    | REAL*8     | REAL*8      |
  |      |         | QMAX1    | REAL*16    | REAL*16     |
  +------+---------+----------+------------+-------------+
  See also the AMAX0, MAX0, and MAX1 intrinsic functions.