
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 that the arithmetic sequence {a_n} starts with 3 and has a common difference of 1, and the geometric sequence {b_n} starts with 1 and has a common ratio of 2, find the value of b_{a_1}+b_{a_2}+b_{a_3}+b_{a_4}.

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