In the convenience store, every 3 empty soda bottles can be exchanged for 1 bottle of soda. Xiaodong bought 66 bottles of soda during the summer vacation, and then exchanged the empty bottles for soda after drinking, so how many bottles of soda can she drink at most?
便民冷饮店每3个空汽水瓶可以换1瓶汽水，小东在暑假里买了66瓶汽水，喝完后又用空瓶换汽水，那么她最多能喝到多少瓶汽水．
<gadget id="calculator">66 / 2</gadget>
<output>33</output>

<gadget id="calculator">66 + 33</gadget>
<output>99</output>

<result>99</result>