There are 5 cents, 1 jiao, 5 jiao, and 1 yuan coins each, how many different currency values can be formed in total.
有5分、1角、5角、1元的硬币各一枚，一共可以组成多少种不同的币值．
<gadget id="calculator">4 + 6 + 4 + 1</gadget>
<output>15</output>

<result>15</result>