PROGRAM Pollution

!---------------------------------------------------------------------------------------

!Program that reads 3 pollution levels, calculates a pollution

!index as their integer average, and then displays an appropriate

!air-quality message.  Identifiers used are:

!  Level_1, Level_2, Level_3 : The three pollution levels

!  Cutoff : a cutoff value that distinguishes between hazardous

!           and safe conditions (parameter)

!  Index  : the integer average of the pollution levels

!

! Input:     The three pollution levels and the cutoff value 

! Constant:  The cutoff value (parts per million)

! Output:    The pollution index and a "safe condition" message if

             this index is les than the cutoff value, otherwise a 

             "hazardous condition" message

!----------------------------------------------------------------------------------------


IMPLICIT NONE 

INTEGER :: Level_1, Level_2, Level_3, Index

INTEGER, PARAMETER :: Cutoff=50


! Get the 3 pollution readings

PRINT *, "Enter 3 pollution readings (parts per million) :"

READ *, Level_1, Level_2, Level_3


! Calculate the pollution index

Index = (Level_1 + Level_2 + Level_3) / 3


! Check if the pollution index is less than the Cutoff and 

! display an appropriate air-quality message

IF (Index < Cutoff) THEN

  PRINT *, "Safe condition"

ELSE

  PRINT *, "Hazardous condition"

END IF


END PROGRAM Pollution



여기까지가 제가 짠건데 계속 line14,15가 Not a valid FORTRAN statement 라고 뜨는데 


어디가 잘못된건가요 


봐도봐도 모르겠네요..