What is the sum of all prime numbers up to 15 times the sum of all composite numbers?
不超过15的所有质数的和是所有合数的和的多少倍．
<gadget id="calculator">2 + 3 + 5 + 7 + 11 + 13</gadget>
<output>41</output>

<gadget id="calculator">4 + 6 + 8 + 9 + 10 + 12 + 14 + 15</gadget>
<output>78</output>

<gadget id="calculator">41 / 78</gadget>
<output>41/78 = around 0.525641</output>

<result>41/78 = around 0.525641</result>