
    Given a binary status code representing a delivery vehicle's hourly availability schedule, develop a function that identifies and reserves the earliest available time slot by changing the leftmost 0 to 1 in the binary representation. The function should efficiently process the vehicle's current schedule encoded as an integer n, where each bit position represents a specific time slot (0 for available, 1 for occupied), and return the updated schedule with the earliest available slot marked as reserved.
    

    
def set_left_most_unset_bit(n):
    """
    Given a binary status code representing a delivery vehicle's hourly availability schedule, develop a function that identifies and reserves the earliest available time slot by changing the leftmost 0 to 1 in the binary representation. The function should efficiently process the vehicle's current schedule encoded as an integer n, where each bit position represents a specific time slot (0 for available, 1 for occupied), and return the updated schedule with the earliest available slot marked as reserved.
    

    """
def set_left_most_unset_bit(n):
    """
    Given a binary status code representing a delivery vehicle's hourly availability schedule, develop a function that identifies and reserves the earliest available time slot by changing the leftmost 0 to 1 in the binary representation. The function should efficiently process the vehicle's current schedule encoded as an integer n, where each bit position represents a specific time slot (0 for available, 1 for occupied), and return the updated schedule with the earliest available slot marked as reserved.
    

    """
    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