In the morning, Ms. Wilkins put some pencils for her students in a pencil box. After a while, she found that ½ of the pencils were gone. A little later, she found that of the pencils that were left from when she checked before ⅓ were gone. Still later, Ms. Wilkins found that ¼ of the pencils that were left from the last time she checked were gone. At that point there were 15 pencils left. No pencils were ever added to the pencil box. How many pencils did Ms. Wilkins put in the pencil box in the morning?

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