A monkey eats 63 peaches. On the first day, he eats half and adds another half. After that, he eats the remaining half of the previous day and then adds another half. After how many days, the peaches are all eaten.
一只猴吃63只桃，第一天吃了一半加半只，以后每天吃前一天剩下的一半再加半只，则多少天后桃子被吃完．
<result>6</result>