đếm xem có bao nhiêu số 8 :
99999999999999999999999999999999999999999999999998999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999998999999999999999999999999999999999999999999998999999999999999999999999999999999999999999999999999999999999999999999989999999999999999999999999999999999989999999999999999999999999999999999999999899999999999999999999999999999999999899999999999999999999999999899999999999999999999999999899999999999999999999999899999999999999999999999999999999999999999998999999999999999999999999999989999999999999999999999999999999999999999999989999999999999999999999999999999999899999999999999999999999999999999999999999999999999999999999999999999989999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999899999999999999999999999999999999999999999999999999999999899999999999999999999999999999999999999999999999999999999899999999999999999999999999999999999999999999999999999999999999999999999999999989999999999999999999999999999999999999999999999999999998999999999999999999999999999999999999999999999999999999999999999999998999999999999999999999999999999999999999998999999999999999999999999999999999999999999999999899999999999999999999999999999999999999999999989999999999999999999999999999998999999999999999999999999999999999999999999
Tính cả đầu bài là 22 số
ko tính đầu bài là 21 số
Nhấn 8 f3 là cứ vô tư mà đếm đêê