
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

Damao, Ermao, and Sanmao are three brothers. Damao tells Sanmao: “When Dad was 36 years old, my age was 4 times yours, and Ermao’s age was 3 times yours.” Ermao adds: “Yes, at that time, the sum of our three ages was exactly half of Dad’s current age.” Sanmao says: “Now, the total age of all four of us adds up to 108 years.” How old is Sanmao this year?

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