In a basket of apples, if you take 3 by 3, there will be 1 left in the end, if you take 5 by 5, there will be 1 left in the end, how many apples are there at least in this basket?
一筐苹果，如果3个3个地拿，最后剩1个，如果5个5个地拿，最后也剩1个，这筐苹果最少有多少个？
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">15 + 1</gadget>
<output>16</output>

<result>16</result>