The number of people doing exercises on the playground is between 400 and 450 people. There are exactly 2 more people in a row of 4 people, 6 people or 7 people. How many people are doing exercises on the playground.
操场上做操的人数在400～450人之间．4人一排、6人一排或7人一排都正好多2人．操场上有多少人在做操．
<gadget id="calculator">84 * 5</gadget>
<output>420</output>

<gadget id="calculator">420 + 2</gadget>
<output>422</output>

<result>422</result>