There are several students in the fifth grade lined up to do exercises. If there is one more student in a group of 3, one student in a group of 4, and one student in a group of 5, at least how many people are doing exercises?
五年级有若干名学生排队做操，如果3人一行余1人，4人一行余1人，5人一行也是余1人，做操的至少有多少人？
<gadget id="calculator">3 * 4 * 5</gadget>
<output>60</output>

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

<result>61</result>