There are 1 yuan, 5 jiao, 2 jiao, and 1 jiao banknotes each, how many different currency values can be formed in total.
现有1元，5角、2角、1角的纸币各一张，一共可以组成多少种不同的币值．
<gadget id="calculator">1 * 10</gadget>
<output>10</output>

<gadget id="calculator">4 + 10 + 1</gadget>
<output>15</output>

<result>15</result>