There are 8 consecutive natural numbers, the sum of the first 3 numbers is 36, what is the sum of the last 4 numbers?
连续8个自然数，前3个数的和是36，那么后4个数的和是多少．
<gadget id="calculator">15 + 16 + 17 + 18</gadget>
<output>66</output>

<result>66</result>