
    Given a customer's financial preference profile represented as a binary number where each bit indicates a specific financial service option, develop a function that identifies and activates the leftmost inactive service option (represented by 0) by setting it to 1. The function should maintain all previously activated services while enabling one additional service that has the highest priority (leftmost position) among the currently inactive options.
    

    
def set_left_most_unset_bit(n):
    """
    Given a customer's financial preference profile represented as a binary number where each bit indicates a specific financial service option, develop a function that identifies and activates the leftmost inactive service option (represented by 0) by setting it to 1. The function should maintain all previously activated services while enabling one additional service that has the highest priority (leftmost position) among the currently inactive options.
    

    """
def set_left_most_unset_bit(n):
    """
    Given a customer's financial preference profile represented as a binary number where each bit indicates a specific financial service option, develop a function that identifies and activates the leftmost inactive service option (represented by 0) by setting it to 1. The function should maintain all previously activated services while enabling one additional service that has the highest priority (leftmost position) among the currently inactive options.
    

    """
    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