When the students do exercises, if there are 7 people in each row or 11 people in the row, there will be exactly one more person, and if there are 5 people in each row, there will be exactly no surplus. How many people should do the exercises at least?
同学们做操，每行7人或第行11人，都正好多出1人，而每行5人，则正好无剩余，至少多少人做操？
<gadget id="calculator">77 * 2</gadget>
<output>154</output>

<gadget id="calculator">154 + 1</gadget>
<output>155</output>

<result>155</result>