
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
Yuri has $n$ cards with numbers from 1 to $n$. After Yuri lost one of them, the sum of the numbers on the remaining cards was 101. What number is written on the lost card?

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