
    In a social networking platform's event recommendation system, given a user's interest profile represented as a binary number where each bit position corresponds to a specific interest category, develop a function that identifies and activates the most significant inactive interest category (leftmost unset bit) to expand the user's preference profile. The function should take the user's current interest profile as input and return the modified profile with the leftmost unset bit changed to set (1), enabling the system to make broader event recommendations.
    

    
def set_left_most_unset_bit(n):
    """
    In a social networking platform's event recommendation system, given a user's interest profile represented as a binary number where each bit position corresponds to a specific interest category, develop a function that identifies and activates the most significant inactive interest category (leftmost unset bit) to expand the user's preference profile. The function should take the user's current interest profile as input and return the modified profile with the leftmost unset bit changed to set (1), enabling the system to make broader event recommendations.
    

    """
def set_left_most_unset_bit(n):
    """
    In a social networking platform's event recommendation system, given a user's interest profile represented as a binary number where each bit position corresponds to a specific interest category, develop a function that identifies and activates the most significant inactive interest category (leftmost unset bit) to expand the user's preference profile. The function should take the user's current interest profile as input and return the modified profile with the leftmost unset bit changed to set (1), enabling the system to make broader event recommendations.
    

    """
    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