A peach costs one yuan, and three peach stones can be exchanged for one peach, so how many peaches can be eaten for 10 yuan.
一元钱一个桃子，三个桃核可以换一个桃子，则10元钱能吃到多少个个桃子．
<gadget id="calculator">10 + 3 + 1 + 1</gadget>
<output>15</output>

<result>15</result>