Xiao Ming and his father went to the shooting range to shoot together. They agreed: each shot 6 times, and each time he hit the target, he would shoot 2 more times. In this way, Xiao Ming shot 18 times in total, and how many times did Xiao Ming miss the target.
小明和爸爸同去靶场打靶，他们约定：每人各射击6次，每次打中靶的话，再追加射击2次．这样小明共射击了18次，小明没有射中靶的共有多少次．
<result>12</result>