What is the smallest number that has a remainder of 1 when divided by 3 and 5?
某数除以3和5都余1，这个数最小是多少．
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

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

<result>16</result>