Questions?

I am building a calculator, for each answer I have entered a value in numbers.

I want to show the result 1 to people who have a total value that is between 1 and 16.

The result 2 to people who have a total value that is between 17 and 85.

The result 3 to people who have a value between 86 and 126.

Can you tell me the mathematical formula to use?

Thanks