
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
A class has 60 students, and each student is assigned a random number from 1 to 60. If we use systematic sampling to draw a sample of size 5 (equidistant sampling), and it is known that students with numbers 4, a, 28, b, and 52 are in the sample, then $a+b=$ ______.

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