If the square is divided by a "cross", it is divided once and divided into 4 squares. If divided twice, it is divided into 7 squares. Use "cross" to divide continuously and divide into 361 squares, how many times is it divided in total.
如果用"十字形"分割正方形，分割一次，分成4个正方形．如果分割二次，分成7个正方形．用"十字形"连续分割，分成361个正方形，则共分割了多少次．
<result>120</result>