The second time from B to A 224/2*3- 16=320.
The third time from A to B 320/2*3- 16=464.
The fourth b to A 464/2*3- 16=680.
……680/2*3- 16= 1004
…… 1004/2*3- 16= 1490
...1490/2 * 3-16 = 2219, that is, 160 times 1.5 times X 1.5 minus1.
Because160 *1.5 *1.5 *1.5 *1.5 *. 10000
1* *11time