How to configurate LM2941S?

In the following circuit, how to fill the number of the two resistors?

Follow the picture of the circuit of the voltage regulator LM2941S.


You can use a potentiometer to make Vout adjustable or you can calculate both R1 and R2 to make Vout fixed.

In case you want to make it fixed: What voltage do you have in Vin and what voltage do you require in Vout?