Дан двухмерный массив M*N. Посчитать количество строк с отрицательными элементами — QBasic(Бейсик)

CLS
INPUT "vveddite stroli"; m
INPUT "vvedite stolbzi"; n
DIM a(m, n)
FOR i = 1 TO m
    FOR j = 1 TO n
        PRINT "vvedite element, stolbez ="; i; "stroka ="; j
        INPUT a(i, j)
    NEXT
NEXT
FOR i = 1 TO m
    b = 0
    FOR j = 1 TO n
        IF a(i, j) < 0 THEN b = 1
    NEXT
    IF b <> 0 THEN k = k + 1
NEXT
CLS
PRINT "massiv"
FOR i = 1 TO m
    FOR j = 1 TO n
        PRINT a(i, j);
    NEXT
    PRINT
NEXT
PRINT "otriz strok ="; k