
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

Person A writes down the number 1. For any number $n$ already written, A next writes down $5n$ and $5n + 1$, provided they are both less than 1000. Person B calculates the sum of any two different numbers written by A. How many different sums can B obtain in total?

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