
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 first term of the arithmetic sequence $\{a_n\}$ is $a_1$, and the common difference $d = -1$. The sum of the first $n$ terms is $S_n$.
1. If $S_5 = -5$, find the value of $a_1$.
2. If $S_n \leq a_n$ for any positive integer $n$, find the range of values for $a_1$.

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