
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
The initial number of inhabitants of a city of more than  $150$  inhabitants is a perfect square. With an increase of  $1000$  inhabitants it becomes a perfect square plus a unit. After from another increase of  $1000$  inhabitants it is again a perfect square. Determine the quantity of inhabitants that are initially in the city.

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