A unit gathers, each row has 4, 5, or 7 people, and the last row has only 2 people. What is the minimum number of people in this unit?
一个单位集合，每排4人、5人、或者7人，最后一排都只有2人，这个单位最少有多少人．
<gadget id="calculator">2 * 2 * 5 * 7</gadget>
<output>140</output>

<gadget id="calculator">140 + 2</gadget>
<output>142</output>

<result>142</result>