
    In a bank's fraud detection system, develop a function that identifies and flags the most significant unmonitored fraud indicator in a transaction pattern, where each bit represents a specific fraud check (0 for unmonitored, 1 for monitored). The function should update the pattern by setting the leftmost unmonitored indicator to monitored status, enhancing the overall fraud detection coverage.
    

    
def set_left_most_unset_bit(n):
    """
    In a bank's fraud detection system, develop a function that identifies and flags the most significant unmonitored fraud indicator in a transaction pattern, where each bit represents a specific fraud check (0 for unmonitored, 1 for monitored). The function should update the pattern by setting the leftmost unmonitored indicator to monitored status, enhancing the overall fraud detection coverage.
    

    """
def set_left_most_unset_bit(n):
    """
    In a bank's fraud detection system, develop a function that identifies and flags the most significant unmonitored fraud indicator in a transaction pattern, where each bit represents a specific fraud check (0 for unmonitored, 1 for monitored). The function should update the pattern by setting the leftmost unmonitored indicator to monitored status, enhancing the overall fraud detection coverage.
    

    """
    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