There are 5 natural numbers written on the blackboard: 1, 3, 5, 7, 9. One operation refers to randomly selecting two numbers on the blackboard, then erasing them, writing their sum on the blackboard, and writing their product on the blackboard on a piece of paper. After 4 such operations, there is only 1 number left on the blackboard, and 4 numbers are written on the paper. Find the sum of these 4 numbers.
黑板上写有5个自然数：1，3，5，7，9，一次操作是指随意选择黑板上两个数，然后擦掉，将它们的和写在黑板上，并且将它们的乘积写在一张纸上．经过4次这种操作，黑板上只剩下1个数，纸上写有4个数，求这4个数之和．
<gadget id="calculator">3 + 20 + 63 + 144</gadget>
<output>230</output>

<result>230</result>