def fibonacci(n):
    a, b = 0, 1
    for _ in range(2, n):
        a, b = b, a + b
        print(f"{a=} {b=}")
    print(f"{b=}")
    return b


def main():
    index = 7
    fib_value = fibonacci(index)
    print(f"{index}-tý prvek Fibonacciho posloupnosti je: {fib_value}")


if __name__ == "__main__":
    main()