One dime, 2 jiao, 5 jiao and 1 yuan coins each. With one or several of these coins, how many commodities with different prices can be bought at most without refunding?
1角、2角、5角和1元硬币各一枚，用这几枚钱中的1枚或几枚，最多可以买几种不同价格的商品而不用退钱？
<gadget id="calculator">4 + 1 + 5 + 4 + 1</gadget>
<output>15</output>

<result>15</result>