When a number is divided by 5, the remainder is 1, and when divided by 6, the remainder is 1. What is the smallest number?
一个数被5除余1，被6除余1，这个数最小是多少．
<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">30 + 1</gadget>
<output>31</output>

<result>31</result>