Some pigeons fly back to 7 lofts, it always turns out that at least two pigeons fly back to one loft, at least how many pigeons.
一些鸽子飞回7个鸽舍，结果总是至少有两只鸽子飞回一个鸽舍，至少有多少只鸽子．
<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<result>8</result>