Change a value in a cell depending on the inputted value

Hello,

I hope this is in the correct place sorry if not.

I am trying to create a spreadsheet to allow me to work out race results.

I need it to work as follows:

in heat 1 I type in cell b2 that a car came 1st ( i would like to type the postition number only. e.g. "1". Then it say 55 points and position 2 45 points etc etc.

I hope that makes sense

Thanks in advance

Gavin