
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
Using systematic sampling to select a sample of size 20 from 160 students, number the students from 1 to 160, and divide them into 20 segments in order of their numbers (1~8, 9~16, ..., 153~160). If the number to be drawn from the 16th segment is 125, then the number determined by simple random sampling in the first segment is $\boxed{5}$.

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