Sure, here is a Python script that can be used to calculate a salary based on a given input:

```py
import argparse

parser = argparse.ArgumentParser()
parser.add_argument("--salary", type=int, help="the salary to calculate")
args = parser.parse_args()

if args.salary:
    yearly_salary = args.salary * 12
    print("Yearly salary: {}".format(yearly_salary))
```

To use this script, run the command `python salary.py --salary 2000` and it should print out the yearly salary for the given input.

I hope this is helpful. Please ask if you would like any modifications to this program.
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