Students in Class 61 of a certain elementary school subscribe to magazines. There are three different magazines to choose from.
某小学的六1班同学订阅杂志，共有三种不同的杂志可供选择，每位同学必须订两种不同的杂志，最后统计上来，有16人订阅情况完全相同，六1至少有多少人．
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">3 * 1</gadget>
<output>3</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<gadget id="calculator">4 * 15</gadget>
<output>60</output>

<gadget id="calculator">60 + 1</gadget>
<output>61</output>

<result>61</result>