
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
$\textbf{Diego's Stamping Landscapes}$

Diego categorizes his stamp collection by country and by the decade they were issued. The prices he paid for them at a different stamp shop were: Brazil and Colombia, $7$ cents each, Peru $5$ cents each, and Argentina $6$ cents each. (Brazil, Peru, and Colombia are South American countries, while Argentina is mentioned for additional context but not needed for the problem.) In Diego's collection, the number of stamps from each country before the 1980s is as follows:
- Brazil: 50s - 6 stamps, 60s - 9 stamps
- Peru: 50s - 8 stamps, 60s - 5 stamps
- Colombia: 50s - 7 stamps, 60s - 6 stamps

Calculate the total cost of Diego's South American stamps issued before the 1980s.

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