
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
Place 100 ping-pong balls into 26 boxes arranged in a row from left to right. If the leftmost box contains 4 ping-pong balls, and the sum of the number of ping-pong balls in any four consecutive boxes is 15, how many ping-pong balls are in the rightmost box?

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