Given that the greatest common divisor of two numbers is 18 and the least common multiple is 378, find the sum of these two numbers.
己知两个数的最大公约数是18，最小公倍是378，求这两个数的和．
<gadget id="calculator">3 + 7</gadget>
<output>10</output>

<gadget id="calculator">10 * 18</gadget>
<output>180</output>

<result>180</result>