
    In a bank's transaction monitoring system, write a function that identifies and activates the next pending security check in the verification sequence, represented by the leftmost unset bit (0) in the transaction's binary flag status. The function should take a binary number representing the current state of security checks and return a new binary number with the leftmost unchecked status changed to checked (0 to 1), helping maintain the sequential integrity of the transaction verification process.
    

    
def set_left_most_unset_bit(n):
    """
    In a bank's transaction monitoring system, write a function that identifies and activates the next pending security check in the verification sequence, represented by the leftmost unset bit (0) in the transaction's binary flag status. The function should take a binary number representing the current state of security checks and return a new binary number with the leftmost unchecked status changed to checked (0 to 1), helping maintain the sequential integrity of the transaction verification process.
    

    """
def set_left_most_unset_bit(n):
    """
    In a bank's transaction monitoring system, write a function that identifies and activates the next pending security check in the verification sequence, represented by the leftmost unset bit (0) in the transaction's binary flag status. The function should take a binary number representing the current state of security checks and return a new binary number with the leftmost unchecked status changed to checked (0 to 1), helping maintain the sequential integrity of the transaction verification process.
    

    """
    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