cube = lambda x: x**3 

def fibonacci(n):
    # return a list of fibonacci numbers
    first = 0 
    second = 1 
    fibonacci_list = []
    if n==0:
        return []
    elif n==1:
        return [first]
    elif n==2:
        return [first, second]
    else:
        fibonacci_list.append(first)
        fibonacci_list.append(second)
        for i in range(3, n+1):
            num = first + second
            fibonacci_list.append(num)
            first = fibonacci_list[i-2]
            second = fibonacci_list[i-1]
    return fibonacci_list