There is a batch of bread, if every 2 bags are packed, there is still 1 unfinished, if every 5 bags are packed, there are still 4 unfinished. How many breads are there at least in this batch?
有一批面包，如果每2个装一袋，还有1个没装完，如果每5个装一袋，还剩下4个没装完．这批面包最少有几个？
<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<result>9</result>