
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
A snail crawls from one tree to another. In half a day, it crawled \( l_1 = 4 \, \text{m} \). It got bored, turned back, and after covering \( l_2 = 3 \, \text{m} \), it got tired and went to sleep. The next day, it repeated the same pattern. This process continues every day. The distance between the trees is \( s = 40 \, \text{m} \). On which day of its journey will the snail reach the tree?

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