There are 42 students in Class 3 and 1, and each of them subscribes to at least one newspaper. There are 32 people who subscribe to "Primary School Students' Mathematics Journal", and 27 people who subscribe to "Youth Daily". At least how many people subscribe to both newspapers?
三1班有42名同学，每人都至少定一份报纸，定《小学生数学报》的有32人，定《少年报》的有27人，至少有多少人两种报纸都定了？
<gadget id="calculator">27 + 32</gadget>
<output>59</output>

<gadget id="calculator">59 - 42</gadget>
<output>17</output>

<result>17</result>