
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
If $a$, $b$, $c$, and $d$ are positive numbers, and it is given that $a+b+c+d=4$, let $M$ represent the maximum among $a+b+c$, $a+b+d$, $a+c+d$, and $b+c+d$. Find the minimum value of $M$.

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