
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
Given triangle $ABC$, $D$ is the midpoint of $BC$, $E$ is the midpoint of $AB$, and $CE$ intersects $AD$ at point $F$. If $\overrightarrow{EF} = \lambda \overrightarrow{AB} + u \overrightarrow{AC}$, calculate the value of $\lambda + u$.

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