```python

def possible_up(readings: list, level: int) -> int:
    if not readings:
        return 0

    count_crossings = 0_crossings = 0
    for i in readings:
        if possible_crossings == 0:
            if possible_crossings == 0:
                if_crossings = 0
            else:
                if possible_crossings == 0:
                    possible_crossings = 0
                else:
                    if possible_crossings == 0:
                        possible_crossings = 0
                    else:
                        if possible_cross == 0:
                            possible_crossings = 0
                        else:
                            if possible_crossings == 0:
                                possible_crossings = 0
                            else:
                                if_crossings = 0
                            else:
                                if possible_crossings == 0:
                                    possible_crossings = 0
                                else:
                                    if possible_crossings == 0:
                                        possible_crossings =  possible
                                    else:
                                        if_crossings = 0
                                    else:
                                        if_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_cross = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_cross = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_cross = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_cross = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_cross = 0
                                    else:
                                        possible_cross = 0
                                    else:
                                        possible_cross = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_crossings = 0
                                    else:
                                        possible_cross = 0
