I'm trying to convert a fibonacci function from python to scheme,

```
def fib(n):
    if n == 1:
        return 0
    if n == 2:
        return 1
    return fib(n-1) + fib(n-2)

```

to

```
(define (fib n)
    (if (= n 1)
         0)
    (if (= n 2)
         1)
    (+ fib (- n 1)) (fib (- n 2)))

```

I get error here because apparently scheme requires an `else` statement. However, as a novice scheme learner, I can't figure out how to make it with an else statement. Can anyone help? thanks.