
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
In the diagram, a grid consisting of squares is presented. Calculate the area of the shaded region. The grid is defined as follows:
- The entire grid is 13 units wide and 5 units high.
- The shaded region starts from the bottom left corner to the top right corner, excluding a right-angled triangle in the top right corner with a base of 13 units and a height of 5 units.

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