There are 160 students in the sixth grade of Hongxing Primary School, and the ratio of boys to girls is 1:1. At least how many people are randomly selected to ensure that there are both boys and girls among the students selected?
红星小学六年级有160人，男生和女生人数比是1：1，至少随机选取多少人才能保证选取的学生中男生和女生都有？
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">160 / 2</gadget>
<output>80</output>

<gadget id="calculator">80 + 1</gadget>
<output>81</output>

<result>81</result>