
    Given a binary number representing the status of fraud detection checks on a credit card transaction, write a function that implements the next available security verification by setting the leftmost unchecked (0) bit to checked (1). The function should identify the first occurrence of 0 from left to right in the binary representation and change it to 1, effectively activating the highest priority pending security check in the transaction verification sequence.
    

    
def set_left_most_unset_bit(n):
    """
    Given a binary number representing the status of fraud detection checks on a credit card transaction, write a function that implements the next available security verification by setting the leftmost unchecked (0) bit to checked (1). The function should identify the first occurrence of 0 from left to right in the binary representation and change it to 1, effectively activating the highest priority pending security check in the transaction verification sequence.
    

    """
def set_left_most_unset_bit(n):
    """
    Given a binary number representing the status of fraud detection checks on a credit card transaction, write a function that implements the next available security verification by setting the leftmost unchecked (0) bit to checked (1). The function should identify the first occurrence of 0 from left to right in the binary representation and change it to 1, effectively activating the highest priority pending security check in the transaction verification sequence.
    

    """
    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