
    Design a function for an adaptive learning system that identifies and fills the next available learning gap in a student's skill mastery profile, where the profile is represented as a binary number with 1s indicating mastered concepts and 0s indicating gaps. The function should locate the leftmost 0 (unmastered concept) in the student's profile and mark it as mastered (change it to 1), representing the student's progression to their next achievable learning milestone.
    

    
def set_left_most_unset_bit(n):
    """
    Design a function for an adaptive learning system that identifies and fills the next available learning gap in a student's skill mastery profile, where the profile is represented as a binary number with 1s indicating mastered concepts and 0s indicating gaps. The function should locate the leftmost 0 (unmastered concept) in the student's profile and mark it as mastered (change it to 1), representing the student's progression to their next achievable learning milestone.
    

    """
def set_left_most_unset_bit(n):
    """
    Design a function for an adaptive learning system that identifies and fills the next available learning gap in a student's skill mastery profile, where the profile is represented as a binary number with 1s indicating mastered concepts and 0s indicating gaps. The function should locate the leftmost 0 (unmastered concept) in the student's profile and mark it as mastered (change it to 1), representing the student's progression to their next achievable learning milestone.
    

    """
    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