
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
There are 5 natural numbers written on the blackboard: 1, 3, 5, 7, 9. An operation consists of choosing any two numbers on the blackboard, erasing them, writing their sum on the blackboard, and noting their product on a piece of paper. After 4 such operations, only one number remains on the blackboard and 4 numbers are written on the paper. Find the sum of these 4 noted numbers.

Present the answer in LaTex format: \boxed{Your answer}
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