
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 complex numbers $z_1 = -1 + i$, $z_2 = 1 + i$, $z_3 = 1 + 4i$, corresponding to points A, B, C respectively, if $\overrightarrow{OC} = x \overrightarrow{OA} + y \overrightarrow{OB}$ ($x, y \in \mathbb{R}$), then the value of $x+y$ is \_\_\_\_\_\_.

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