A store stipulates that 3 empty soda bottles can be exchanged for 1 bottle of soda. Xiaohua bought 10 bottles of soda, and exchanged the empty soda bottles for soda after eating. How many bottles of soda can Xiaohua drink in total?
某商店规定3个空汽水瓶可以换一瓶汽水．小华买了10瓶汽水，吃完后用空汽水瓶去换汽水．小华一共可以喝到多少瓶汽水？
<gadget id="calculator">10 + 3 + 1 + 1</gadget>
<output>15</output>

<result>15</result>