72. A positive integer $x$, if it is appended to any two positive integers, the product of the two new numbers still ends with $x$, then $x$ is called a "lucky number". For example: 6 is a "lucky number"; but 16 is not, because $116 \times 216=25056$, the end is no longer 16. The sum of all "lucky numbers" with no more than 3 digits is . $\qquad$
Answer: 1114