FibNum.java

public class FibNum {
    public static void main(String args[]) { 
        System.out.printf("%.0f\n", fib(Integer.parseInt(args[0])));
    }
    public static double fib(int n) {
        if (n <= 1)
            return 1;
        else 
            return fib(n-1) + fib(n-2);
    }
}