In a box of Go pieces, if you count 4, you will get 3 more, if you count 6, you will get 5 more, and if you count 7, you will get 6 more. How many chess pieces are there in this box?
一盒围棋子，4个一数则多3个，6个一数则多5个，7个一数则多6个．这盒棋子至少多少个．
<gadget id="calculator">2 * 2 * 3 * 7</gadget>
<output>84</output>

<gadget id="calculator">84 - 1</gadget>
<output>83</output>

<result>83</result>