Numeric

 Numeric (arithmetic) expressions are formed with numeric operands
 and numeric operators, and yield a single numeric value.

 The term numeric includes logical data, because logical data is
 treated as integer data when used in a numeric context.  (.TRUE.
 is -1; .FALSE.  is 0.)

 The numeric operators are as follows:

      Operator    Description
      -----------------------
         **       exponentiation (evaluated
                           right to left)
         *        multiplication
         /        division 
         +        addition
         -        subtraction        

 You can use parentheses to force an order of evaluation.