When a number is divided by 2, the remainder is 1, when divided by 3, the remainder is 1, and when divided by 5, the remainder is 1. What is the smallest number?
一个数除以2余1，除以3余1，除以5也余1，这个数最小是多少
<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

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

<result>31</result>