00100 SUBROUTINE PN(N) 00400 INC=N-J 00450 L=N 00500 IF(INC.GT.512)GO TO 2 00600 IF(INC.GE.-512)GO TO 3 00700 N=J-512 00800 GO TO 5 00900 3 N=J+INC 01000 5 J=N 01010 TYPE 1,L,N,INC 01100 RETURN 01200 2 N=J+512 01300 GO TO 5 01310 1 FORMAT(3I6) 01400 END