
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
Three passenger ships set sail from Shanghai Port on April 1st. They travel back and forth between Shanghai and their destinations, taking 2 days, 3 days, and 5 days for a round trip, respectively. The next time these three passenger ships will converge at Shanghai Port is on     .

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