
    Given a binary status representation of a delivery fleet where 1 indicates an active vehicle and 0 indicates an inactive vehicle, write a function that activates the next available vehicle by changing the leftmost 0 to 1 in the fleet's binary status. The function should efficiently identify and activate only one vehicle at a time, maintaining the status of all other vehicles in the fleet unchanged.
    

    
def set_left_most_unset_bit(n):
    """
    Given a binary status representation of a delivery fleet where 1 indicates an active vehicle and 0 indicates an inactive vehicle, write a function that activates the next available vehicle by changing the leftmost 0 to 1 in the fleet's binary status. The function should efficiently identify and activate only one vehicle at a time, maintaining the status of all other vehicles in the fleet unchanged.
    

    """
def set_left_most_unset_bit(n):
    """
    Given a binary status representation of a delivery fleet where 1 indicates an active vehicle and 0 indicates an inactive vehicle, write a function that activates the next available vehicle by changing the leftmost 0 to 1 in the fleet's binary status. The function should efficiently identify and activate only one vehicle at a time, maintaining the status of all other vehicles in the fleet unchanged.
    

    """
    if not n & n + 1:
        return n
    (pos, temp, count) = (0, n, 0)
    while temp:
        if not temp & 1:
            pos = count
        count += 1
        temp >>= 1
    return n | 1 << pos