задача3.

CLS
INPUT "N=", N
DIM M(N)
PRINT

FOR T = 1 TO N
PRINT "M["; T; "]=";
INPUT M(T)
NEXT T

PRINT "Shchitaem"

B = 1
FOR T = 1 TO N
IF (M(T) > 0) AND (M(T) < 20) THEN
B = B * M(T)
END IF
NEXT T

PRINT B
PRINT "Bye bye"
END


тут всё правильно?