
    In a loan pre-approval system, write a function that identifies and upgrades the next available credit qualification factor in a customer's binary credit profile, where each bit represents a specific credit criterion (1 for met, 0 for unmet). The function should locate the leftmost unmet criterion (0 bit) and set it to met (1 bit), effectively improving the customer's credit qualification status at the highest possible level.
    

    
def set_left_most_unset_bit(n):
    """
    In a loan pre-approval system, write a function that identifies and upgrades the next available credit qualification factor in a customer's binary credit profile, where each bit represents a specific credit criterion (1 for met, 0 for unmet). The function should locate the leftmost unmet criterion (0 bit) and set it to met (1 bit), effectively improving the customer's credit qualification status at the highest possible level.
    

    """
def set_left_most_unset_bit(n):
    """
    In a loan pre-approval system, write a function that identifies and upgrades the next available credit qualification factor in a customer's binary credit profile, where each bit represents a specific credit criterion (1 for met, 0 for unmet). The function should locate the leftmost unmet criterion (0 bit) and set it to met (1 bit), effectively improving the customer's credit qualification status at the highest possible level.
    

    """
    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