53. There is a wooden stick $A B$ that is 252 centimeters long. Starting from endpoint $\mathrm{A}$, Qiqi makes a mark every 4 centimeters, Lingling makes a mark every 7 centimeters, and Feifei makes a mark every 9 centimeters. If the stick is sawed into smaller segments according to these marks, $A B$ will be sawed into $\qquad$ segments.
Reference answer: 108