
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 some natural numbers written on the blackboard, with an average of 30. After adding the number 100, the average becomes 40. If another number is added, the average then becomes 50. What is the last number that is added?

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