Just your genericly recursive fibonacci function; nothing is concatenated, obfuscated or optimized. It's written in java to use in various assignments.

fibonacci.java

public class fibonacci
{
    public static void main(String[] args)
    {
        System.out.println(fibonacciValue(5));
    }
    
    public static int fibonacciValue(int fibonacciIndex)
    {
        if(fibonacciIndex < 2) {return 1;}
        return fibonacciValue(fibonacciIndex - 2) + fibonacciValue(fibonacciIndex - 1);
    }
}