
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
The output of the following program after execution is $S=$______.

$i=1$

$S=0$

$WHILE$ $i <=50$

$S=S+i$

$i=i+1$

$WEND$

$PRINT S$

$END$

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