300
1) I told my students to stack the books neatly and they made a mess. 2) I told my students to stack their books neatly, but they made a mess. 3) My students made a mess stacking their books when I told them. 4) The students, with their books, made a mess when I told them to stack them.
What is I told my students to stack their books neatly, but they made a mess.