
    Write a function that takes a binary transaction security status pattern and updates the highest-priority pending security check (represented by the leftmost 0) to a passed state (1). The security status pattern is represented as a binary number where each bit indicates whether a specific fraud detection check has passed (1) or is pending (0), with the leftmost position representing the highest-priority check.
    

    
def set_left_most_unset_bit(n):
    """
    Write a function that takes a binary transaction security status pattern and updates the highest-priority pending security check (represented by the leftmost 0) to a passed state (1). The security status pattern is represented as a binary number where each bit indicates whether a specific fraud detection check has passed (1) or is pending (0), with the leftmost position representing the highest-priority check.
    

    """
def set_left_most_unset_bit(n):
    """
    Write a function that takes a binary transaction security status pattern and updates the highest-priority pending security check (represented by the leftmost 0) to a passed state (1). The security status pattern is represented as a binary number where each bit indicates whether a specific fraud detection check has passed (1) or is pending (0), with the leftmost position representing the highest-priority check.
    

    """
    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