How many denominations of renminbi can be formed with 1 jiao, 2 jiao, and 5 jiao RMB?
用1角、2角、5角人民币各一张，可以组成多少种面值的人民币？
<gadget id="calculator">1 + 2 + 1 + 2 + 1</gadget>
<output>7</output>

<result>7</result>