In a pile of colored glass balls, there is one remaining when counting two by one, one remaining by counting three by three, and one remaining by counting five by five, then how many glass balls are there at least in this pile.
一堆彩色玻璃球，二个二个一数余1个，三个三个一数余1个，五个五个一数也余1个，则这一堆玻璃球至少有多少个．
<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

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

<result>31</result>