
    In a banking fraud detection system, implement a function that identifies and marks the highest-priority pending security verification as complete in a transaction's security status bitmap. The security status is represented as a binary number where each bit position corresponds to a specific security check (0 for pending, 1 for completed), and the function should convert the leftmost 0 to 1 to indicate completion of the highest-priority pending verification.
    

    
def set_left_most_unset_bit(n):
    """
    In a banking fraud detection system, implement a function that identifies and marks the highest-priority pending security verification as complete in a transaction's security status bitmap. The security status is represented as a binary number where each bit position corresponds to a specific security check (0 for pending, 1 for completed), and the function should convert the leftmost 0 to 1 to indicate completion of the highest-priority pending verification.
    

    """
def set_left_most_unset_bit(n):
    """
    In a banking fraud detection system, implement a function that identifies and marks the highest-priority pending security verification as complete in a transaction's security status bitmap. The security status is represented as a binary number where each bit position corresponds to a specific security check (0 for pending, 1 for completed), and the function should convert the leftmost 0 to 1 to indicate completion of the highest-priority pending verification.
    

    """
    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