
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
Vasya calculated two sums: consecutive odd numbers from 1 to $2021$ $(1+3+5+\ldots+2021)$ and consecutive even numbers from 2 to $2020$ $(2+4+6+\ldots+2020)$. Then he subtracted the smaller sum from the larger sum. What result did he get?

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