SUBROUTINE MIST(N, BETA)
IMPLICIT REAL*8 (A-H,O-Z)
INTEGER IA, IQ, M1
DIMENSION BETA(N)
DO 80 IQ=1,M1
IF (BETA(IQ).EQ.0.0D0) GO TO 120
80 CONTINUE
120 IF (IQ.NE.1) GO TO 160
160 M1 = IA(IQ)
RETURN
END