There are some apples in the basket, 3 and 3 are 1 more than 5, 5 and 5 are 1 more, and 7 and 7 are neither too many nor too few, so how many apples are there at least in the basket?
篮子里有一些苹果，3个3个地数多1个，5个5个地数也多1个，7个7个数不多也不少，那么篮子里最少有多少个苹果．
<result>91</result>