There is one banknote of 1 yuan, 2 yuan, and 5 yuan each, how many different currency values can be formed in total.
1元、2元、5元的纸币各有一张，一共可以组成多少种不同的币值．
<gadget id="calculator">1 + 2 + 1 + 2 + 1</gadget>
<output>7</output>

<result>7</result>