The students in the physical education group of class 2 and 1 stand in a line. There are 2 less people in 5 rows, and 1 more in 3 rows. How many of these students are there at least? (request process)
二1班体育小组的学生站队，站成5列少2人，站成3列多1人，这些学生最少有多少人？(要求过程)
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">15 - 2</gadget>
<output>13</output>

<result>13</result>