Hawk and gift box

Ms. Khan likes eating chocolates, she has $B$ number of chocolates in her bag. Ms. Khan becomes happy if she gets a gift box filled with a number of chocolates $A$ which is divisible by the chocolates she already have ($B$) in her bag. To make Ms. Khan happy, Mr. Hawk is preparing a gift box which already have $X$ number of chocolates inside. And Mr. Hawk puts one chocolate every day in that box.