If a box of chocolates is equally distributed to 5 or 4 people, there are exactly 2 pieces left over, what is the minimum number of pieces of chocolate in this box?
把一盒巧克力平均分给5个人或4个人，都正好余二块，这盒巧克力至少有多少块块．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">20 + 2</gadget>
<output>22</output>

<result>22</result>