
    Develop a function that activates the next available difficulty adjustment in an assignment's configuration, where the configuration is represented as a binary number and each unset bit represents an unused difficulty feature. The function should identify and set the leftmost unset bit (0) to 1, effectively implementing the next incremental difficulty increase based on the current assignment settings.
    

    
def set_left_most_unset_bit(n):
    """
    Develop a function that activates the next available difficulty adjustment in an assignment's configuration, where the configuration is represented as a binary number and each unset bit represents an unused difficulty feature. The function should identify and set the leftmost unset bit (0) to 1, effectively implementing the next incremental difficulty increase based on the current assignment settings.
    

    """
def set_left_most_unset_bit(n):
    """
    Develop a function that activates the next available difficulty adjustment in an assignment's configuration, where the configuration is represented as a binary number and each unset bit represents an unused difficulty feature. The function should identify and set the leftmost unset bit (0) to 1, effectively implementing the next incremental difficulty increase based on the current assignment settings.
    

    """
    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