Fibonacci applied to the Score system

Good!

I am in a situation where I must apply the Fibonacci assignment in a scoring system.

The exercise sounds simple, but I'm not finding the best way to do it, so I decided to buy opinions

I have something done so far. But with one of the problems that I find, is to be able to take account of the X ships destroyed.

Here I leave what I have done so far.

 public  int fib(int n)
{
       if (n < 2)
       {
           return n;
        }
       else
        {
            return fib(n - 1) + fib(n - 2);
        }
        setScoreToPlayer.Score(n);
    }