
    Given a user's connection recommendation criteria represented as a binary number, where each bit indicates whether a specific matching criterion (like mutual friends, shared interests, or interaction history) is active (1) or inactive (0), develop a function that activates the highest-priority inactive criterion by setting the leftmost unset bit to 1. The function should maintain the status of all other criteria bits unchanged while enabling the next available recommendation feature in the platform's priority sequence.
    

    
def set_left_most_unset_bit(n):
    """
    Given a user's connection recommendation criteria represented as a binary number, where each bit indicates whether a specific matching criterion (like mutual friends, shared interests, or interaction history) is active (1) or inactive (0), develop a function that activates the highest-priority inactive criterion by setting the leftmost unset bit to 1. The function should maintain the status of all other criteria bits unchanged while enabling the next available recommendation feature in the platform's priority sequence.
    

    """
def set_left_most_unset_bit(n):
    """
    Given a user's connection recommendation criteria represented as a binary number, where each bit indicates whether a specific matching criterion (like mutual friends, shared interests, or interaction history) is active (1) or inactive (0), develop a function that activates the highest-priority inactive criterion by setting the leftmost unset bit to 1. The function should maintain the status of all other criteria bits unchanged while enabling the next available recommendation feature in the platform's priority 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