A group of wild geese were flying in the sky, Xiao Ming counted two and two, and there was one left; Xiao Liang counted three and three, and one remained; Xiao Gang counted five and five, and there was one left. How many wild geese are there at least?
一群大雁在天空中飞，小明两只两只地数，剩1只，小亮3只3只地数，也剩1只，小刚5只5只地数又是剩下1只，天空中最少飞来多少只大雁？
<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

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

<result>31</result>