20 little monkeys stand in a row, and there is a peach between two adjacent little monkeys. How many peaches are there in total?
20只小猴站成一排，相邻两只小猴之间有1个桃子，一共有多少个桃子．
<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<result>19</result>