Fill the prime numbers within 20 into □, (each prime number is only used once) A=((□+□+□+□+□+□+□)/(□)), to make A an integer, A What is the maximum.
把20以内的质数分别填入□中，(每个质数只用一次)A=((□+□+□+□+□+□+□)/(□))，要使A为整数，A最大是多少．
<gadget id="calculator">70 / 7</gadget>
<output>10</output>

<result>10</result>