Now there are chickens and rabbits in the same cage, and there are 10 more chickens than rabbits, and there are at least 58 legs in the cage, then at least how many rabbits are there.
今有鸡兔同笼，鸡比兔多10只，笼中至少有脚58只，则至少有兔多少只．
<result>7</result>