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The required variables should be gotten from the program requirements and possibly added to as you write the program as the need arises.

If array's don't come until the next lesson, then they are...

You need to give unique names to all of the int variables.

Not allowing arrays is a strange requirement. Any idea why? What is the learning objective?
Are you expected to use some classes...

What have you done so far with the project? If you have any specific questions about the program you are writing, post the code and your questions.