def get_power_level(x: int, y: int, serial: int = 9306) -> int:
    """Returns the powerlevel at a given coordinate (x, y) based on the serial number {serial}
    
    Arguments:
        x {int} -- x coordinate
        y {int} -- y coordinate
    
    Keyword Arguments:
        serial {int} -- Serial number (default: {9306})
    
    Returns:
        int -- Power level
    """
    rack_id = x + 10
    power_level = rack_id * y
    power_level += serial
    power_level *= rack_id
    power_level //= 100
    power_level %= 10
    power_level -= 5
    return power_level