
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
For each positive integer \( n \), the expression \( 1+2+3+\cdots+(n-1)+n \) represents the sum of all of the integers from 1 to \( n \) inclusive. What integer is equal to
\[ (1+2+3+\cdots+2020+2021) - (1+2+3+\cdots+2018+2019) ? \

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