McNuggets

def McNuggets(n):
    """
    n is an int

    Returns True if some integer combination of 6, 9 and 20 equals n
    Otherwise returns False.
    """
    for a in range(0,n/6+1):
        for b in range(0,n/9+1):
            for c in range(0,n/20+1):
                if (a*6+b*9+c*20)==n:
                    return True
    return False