Дан массив из 15 чисел. Найти сумму чисел массива, начиная с первого числа, равного 4 — QBasic(Бейсик)

CLS
n = 15
DIM a(n)
FOR i = 1 TO n
    PRINT "vvedite element"; i
    INPUT a(i)
NEXT
FOR i = 1 TO n
    IF a(i) = 4 OR s <> 0 THEN s = s + a(i)
NEXT
FOR i = 1 TO n
    PRINT a(i);
NEXT
PRINT
PRINT "summa:"; s

CLS
n = 15
DIM a(n)
FOR i = 1 TO n
    PRINT "vvedite element"; i
    INPUT a(i)
NEXT
FOR i = 1 TO n
    IF a(i) = 4 OR z = 1 THEN s = s + a(i): z = 1
NEXT
FOR i = 1 TO n
    PRINT a(i);
NEXT
PRINT
PRINT "summa:"; s