There are 10 pigeon cages, in order to ensure that there is at most one pigeon in each pigeon cage (you can live without pigeons). So how many pigeons can there be at most?
有10只鸽笼，为保证每只鸽笼中最多住一只鸽子(可以不住鸽子)．那么鸽子总数最多能有几只？
<gadget id="calculator">1 * 10</gadget>
<output>10</output>

<result>10</result>