There are several eggs in the box, 4 and 6 are taken each time, and 1 is left. How many eggs are there at least in this box?
盒子里有若干个鸡蛋，每次取4个和6个，都剩下1个，这盒鸡蛋至少有多少个．
<gadget id="calculator">2 * 2 * 3</gadget>
<output>12</output>

<gadget id="calculator">12 + 1</gadget>
<output>13</output>

<result>13</result>